Either, neither, and both cause persistent problems for English learners because they look simple, appear early in textbooks, and then show up in surprisingly complex grammar patterns. I have corrected these words in placement tests, business emails, academic essays, and spoken fluency interviews, and the same errors repeat across levels: learners confuse singular and plural verbs, mix up negative meaning, misuse prepositions, and transfer patterns directly from their first language. A clear explanation matters because these three words are high-frequency items used to compare options, agree with statements, and build concise sentences. If a learner says “Both of them is ready,” “I don’t like neither option,” or “Either people can join,” the meaning is usually understandable, but the grammar sounds nonstandard or unclear. Mastering these forms improves accuracy fast because the words appear in everyday situations: choosing food, discussing travel plans, comparing products, or writing formal recommendations. This guide explains what either, neither, and both mean, how they function as determiners, pronouns, adverbs, and conjunction-related structures, and where learners most often go wrong. It also covers agreement, word order, parallel structure, and common differences between informal speech and formal written English so you can use these forms confidently and correctly.
Table of contents
1. Core meanings and basic grammar
2. How either works in real sentences
3. How neither works and why double negatives cause trouble
4. How both works with plural meaning
5. Agreement rules, parallel structure, and common patterns
6. A practical correction checklist for learners
Core meanings and basic grammar
The quickest way to understand these words is to start with quantity and choice. Either refers to one of two people, things, or options. Neither means not one and not the other of two. Both means the two together. Those definitions sound elementary, but they control every grammar choice that follows. If the reference is exactly two, these words fit naturally. If the reference is more than two, learners usually need different forms such as any, none, or all. For example, “Either road leads to the station” is correct because there are two roads. “Both answers are acceptable” is correct because two answers are being included. “Neither candidate met the requirement” means the two candidates failed to meet it.
These words can act as determiners before a noun, as in “either option,” “neither answer,” and “both students.” They can also act as pronouns, replacing a noun phrase entirely: “Which jacket do you want?” “Either is fine.” “Which proposal was approved?” “Neither was accepted.” “Do you want the red gloves or the black gloves?” “Both are useful.” They also appear in fixed patterns such as either…or, neither…nor, and both…and. These paired forms connect words, phrases, or clauses and require balanced structure. In edited English, the items after each connector should match grammatically: noun with noun, verb phrase with verb phrase, clause with clause. For instance, “She is both intelligent and patient” is balanced because two adjectives are joined. “He either wants to leave now or to wait until morning” is balanced because two infinitive phrases are joined.
Another key point is number. Either and neither are traditionally singular when they refer to one of two or to not one of two. That is why standard grammar gives us “Either answer is acceptable” and “Neither option works.” Both is plural, so we say “Both answers are acceptable” and “Both options work.” In classroom practice, I have found that learners often remember meaning but forget agreement. They understand that neither is negative, for example, yet still write “Neither of the machines are available.” In careful formal English, the expected form is “Neither of the machines is available.” Spoken English is often looser, and plural verbs after neither of can be heard, but learners aiming for reliable accuracy should keep the singular rule firmly in mind.
How either works in real sentences
Either usually presents a choice between two alternatives. As a determiner, it comes before a singular noun: “Either route takes about thirty minutes.” As a pronoun, it stands alone: “I don’t mind which route we take; either is fine.” In the correlative pair either…or, it introduces alternatives: “You can either call the office or send an email.” The important grammatical idea is that each alternative should be parallel. A common learner error is “You can either call the office or sending an email.” That mixes a bare infinitive phrase with a gerund phrase. The corrected version keeps the forms aligned.
Either also appears in negative contexts with the meaning “also not.” For example: “I don’t like spicy food.” “I don’t either.” This use is different from too and also, which normally go with positive statements. Many learners produce “I don’t too” because they apply the positive pattern mechanically. The natural correction is “I don’t either” in informal American English or “Neither do I,” which is widely accepted in both speech and writing. Position matters too. We say “I can’t come either,” not usually “I either can’t come” when the intended meaning is “also not.” In that sentence, moving either changes the focus and may create ambiguity.
One subtle problem is that learners often overextend either to situations involving more than two items. If a menu has five desserts, “either dessert” is wrong unless only two desserts are under discussion. Native speakers may occasionally use either loosely in conversation, but standard grammar still links it to a pair. Another subtlety involves pronunciation and style. In speech, either may be pronounced /ˈiːðər/ or /ˈaɪðər/, and both are standard. In writing, the choice has no effect, but hearing both forms can confuse learners who think they are different words. They are not.
How neither works and why double negatives cause trouble
Neither is often the most difficult of the three because its meaning is already negative. It means “not one and not the other.” That built-in negativity explains why standard English does not combine it with another negative in the same clause when the intended meaning is simply zero out of two. “I don’t want neither option” is a classic learner mistake. In formal standard English, the correction is either “I want neither option” or “I don’t want either option.” The first uses a single negative word, neither. The second uses the negative verb plus either. Both are correct; they simply package the same idea differently.
As a determiner, neither takes a singular noun: “Neither answer was correct.” As a pronoun, it can stand alone: “Which answer was correct?” “Neither was.” In the correlative pattern neither…nor, it joins two negative alternatives: “The printer is neither fast nor reliable.” “She neither apologized nor explained the delay.” This structure is powerful because it avoids repetition, but it requires balance. “She neither apologized nor gave an explanation” is also correct because the two items are parallel verb phrases in meaning and structure. Problems appear when learners mix categories carelessly, such as “She neither apologized nor an explanation.”
Many students also struggle with responses such as “Neither do I” and “Neither can he.” These are examples of subject-auxiliary inversion after a negative adverbial response. The auxiliary must match the tense or modal of the original statement. If someone says, “I haven’t finished,” the accurate response is “Neither have I.” If someone says, “She can’t swim,” the response is “Neither can he.” In class, I often compare this pattern to question formation because the auxiliary moves before the subject in the same way. Once learners see that logic, the structure becomes easier to remember.
How both works with plural meaning
Both is the most straightforward semantically because it includes two items together, but it still creates regular mistakes in noun phrases and word order. As a determiner, it comes before a plural noun: “Both reports were submitted on time.” As a pronoun, it replaces a plural noun phrase: “Which reports were submitted?” “Both were.” In the paired form both…and, it connects two equal elements: “The course covers both grammar and pronunciation.” Because the meaning is plural, the following verb is plural as well: “Both candidates are qualified,” not “Both candidates is qualified.”
Word order deserves attention. We can say “Both students passed the exam” and “The students both passed the exam.” We can also say “They both passed the exam.” These versions are related, but the placement of both changes with the sentence pattern. Before a noun, it functions as a determiner. After a subject pronoun, it often appears before the main verb but after the auxiliary verb: “They both work here,” “They have both worked here for years,” “They are both ready.” This pattern is common in natural English, and learners who only know “both + noun” often miss it.
Another source of confusion is both of. We say “both books” and “both of the books.” With object pronouns, of is required: “both of them,” “both of us,” “both of you.” The same general pattern appears with either and neither: “either of them,” “neither of us.” Learners often ask whether “both the books” is possible. In modern standard English, “both books” and “both of the books” are the natural choices; “both the books” sounds awkward in most contexts. Accuracy here matters because these combinations appear constantly in speech and writing.
| Form | Core meaning | Standard agreement | Correct example | Common mistake |
|---|---|---|---|---|
| either | one of two | singular | Either option is acceptable. | Either option are acceptable. |
| neither | not one and not the other | singular | Neither answer was correct. | I don’t want neither answer. |
| both | the two together | plural | Both answers were correct. | Both answer was correct. |
| either…or | choice between two | verb agrees with nearest subject in mixed subjects | Either the manager or the assistants are coming. | Either the manager or the assistants is coming. |
| neither…nor | two negative alternatives | verb agrees with nearest subject in mixed subjects | Neither the assistants nor the manager is available. | Neither the assistants nor the manager are available. |
| both…and | two items included | plural | Both the manager and the assistants are available. | Both the manager and the assistants is available. |
Agreement rules, parallel structure, and common patterns
Agreement becomes more complicated when these words appear in longer phrases. With either of and neither of, the traditional rule is singular verb agreement because the head word is singular: “Either of the solutions is workable,” “Neither of the proposals has enough funding.” In contemporary speech, especially after plural nouns, many native speakers use plural verbs, particularly with neither of. You may hear “Neither of the proposals have enough funding.” Learners should recognize the variation but use the singular in formal writing, exams, and professional communication because it remains the safest standard.
With either…or and neither…nor, verb agreement usually follows the subject closest to the verb when the two subjects differ in number. This is sometimes called the principle of proximity. For example, “Either the teachers or the principal is presenting the award” and “Either the principal or the teachers are presenting the award.” The same applies to neither…nor: “Neither the director nor the assistants were informed” versus “Neither the assistants nor the director was informed.” In editing, I often recommend recasting such sentences if they sound awkward. “The principal or the teachers will present the award” may be simpler than forcing a correlative structure.
Parallel structure is equally important. If both…and links nouns, the second element should also be a noun. If it links clauses, both should be clauses. Compare “She both teaches online and writes course materials” with the faulty “She both teaches online and course materials.” The same principle applies to either and neither. Good parallelism improves not only grammar but readability, which is why style guides and advanced writing courses emphasize it. In business English, parallel lists and paired connectors make instructions and proposals easier to scan quickly.
There are also style choices involving brevity and emphasis. “Both of the systems failed” is correct, but “both systems failed” is tighter. “Neither of the candidates was convincing” is fully standard, but “neither candidate was convincing” is often more elegant. “Either of these methods is effective” can become “either method is effective” when the context already makes the pair clear. In my experience editing reports, concise versions usually sound more confident. Still, the longer forms are useful when a pronoun is needed or when the noun phrase must be more explicit, as in “both of the employees who joined last month.”
A practical correction checklist for learners
When you proofread sentences with either, neither, or both, ask five questions. First, are you talking about exactly two items? If not, choose another word. Second, is the meaning positive inclusion, single choice, or negative exclusion? That decision points you toward both, either, or neither. Third, does the verb agree with the form? Remember: either and neither are usually singular; both is plural. Fourth, if you are using a paired connector, are the two parts parallel? Fifth, have you accidentally created a double negative by combining neither with not, don’t, or can’t in the same standard clause?
Here are real correction patterns I use with learners. If a student writes “Both my brother and my sister is doctors,” I first identify the plural meaning created by both…and. The correction becomes “Both my brother and my sister are doctors.” If a student says “I can choose neither color” when the intended meaning is one acceptable option from two, the problem is lexical, not structural; the right form is “I can choose either color.” If the learner writes “I didn’t see both of them” but means zero, the sentence may need “I saw neither of them.” If the learner means not the two together, then “I didn’t see both of them” can be correct, because it may imply seeing only one. Context decides the meaning.
That last example shows why these words matter beyond grammar drills. They shape logic. “Not both” does not mean “neither.” In formal reasoning, “not both A and B” allows one of them to be true, while “neither A nor B” excludes both completely. The same distinction appears in everyday life. “We can’t invite both speakers” means one speaker may still be invited. “We can invite neither speaker” means none will be invited. Precision prevents misunderstanding in contracts, schedules, instructions, and academic arguments.
Either, neither, and both are small words with large grammatical consequences. Once you understand their core meanings, most correct patterns follow naturally: either for one of two, neither for not one of two, and both for the two together. From there, focus on the main trouble spots: singular versus plural agreement, negative meaning, double negatives, of phrases, and parallel structure in either…or, neither…nor, and both…and constructions. Remember too that spoken English sometimes bends formal agreement, especially with neither of, but standard written English remains more consistent. If you want dependable grammar in exams, workplace writing, and fluent conversation, practice by rewriting your own sentences about choices, comparisons, and shared qualities. Check whether you mean one, none, or two. Then choose the form that matches that meaning exactly. Review a page of your recent writing today and correct every example of either, neither, and both until the pattern becomes automatic.
Frequently Asked Questions
1. What is the difference between either, neither, and both?
Either, neither, and both are all used when talking about two people, things, choices, or ideas, but their meanings are very different. Both means the two together: Both answers are correct. Either usually means one of the two, and in many contexts it suggests that each option is possible: You can sit on either side. Neither means not one and not the other: Neither answer is correct.
These words seem basic, but learners often confuse them because they can function in several grammatical patterns. They can act as determiners before nouns, pronouns on their own, or parts of larger structures such as either…or and neither…nor. For example, Both students passed, Either is fine, and Neither of them replied are all correct, but the grammar changes slightly in each pattern.
A very common mistake is confusing the meaning of either and neither because one is positive and the other is negative. Compare these clearly: Either restaurant is good means both are acceptable choices, and you can choose one. Neither restaurant is good means both are unacceptable. Another frequent problem is that learners use these words with more than two items. Traditionally, either and neither refer to two, while both also refers to two. If you are discussing more than two choices, words like any, none, or all are usually better.
2. Why do learners make so many subject-verb agreement mistakes with either, neither, and both?
Subject-verb agreement is one of the biggest trouble spots because the form does not always match what learners expect. The simplest rule is this: both takes a plural verb, while either and neither usually take a singular verb when they are the subject. For example: Both are ready, Either is acceptable, and Neither was available. This surprises many learners because either and neither refer to two things, but grammatically they are treated as singular in these cases.
The confusion becomes even stronger in structures with of. You will often hear: Both of the candidates are qualified, Either of the options is fine, and Neither of the answers is correct. In careful formal English, either of and neither of are usually followed by singular verbs. However, in everyday spoken English, many native speakers use plural verbs, especially after neither of: Neither of them are coming. This is common in conversation, but learners should understand that many teachers, editors, and exams still prefer the singular form: Neither of them is coming.
There is also the issue of paired conjunctions. In either…or and neither…nor structures, the verb usually agrees with the noun closest to it: Either the manager or the assistants are handling the case and Either the assistants or the manager is handling the case. The same idea applies to neither…nor. This “proximity rule” causes mistakes because learners want one fixed verb rule, but the correct form depends on the structure of the whole sentence, not just on the word either or neither.
3. When should I use “either of,” “neither of,” and “both of,” and what comes after them?
Use either of, neither of, and both of when you are referring to two specific people or things. These expressions are normally followed by a determiner plus a plural noun, or by an object pronoun. For example: either of the books, neither of my parents, both of those emails, either of us, neither of them, and both of you. This is an important point because learners often leave out the determiner and produce forms like either of books or both of students, which are incorrect.
In many cases, both of and both are both possible: Both students passed and Both of the students passed. The version without of is often slightly more direct, while the version with of is especially useful before pronouns: both of them, not both them. Similarly, we say either of us and neither of them. With pronouns, of is required.
Learners also struggle with sentence meaning in these patterns. Either of the solutions will work means one solution or the other will work, so each is acceptable. Neither of the solutions will work means zero out of the two will work. Both of the solutions will work means the two are effective. Because the grammar is similar, students often choose the wrong word and create the opposite meaning. That is why it helps to connect each term to a simple meaning: both = two together, either = one or the other, neither = not this one and not that one.
4. How do either…or and neither…nor work in sentences?
Either…or and neither…nor are paired conjunctions used to connect two alternatives. Either…or presents a positive choice between two options: You can either call me or send an email. Neither…nor joins two negative alternatives: Neither the phone nor the email system is working. These patterns are very common in formal and semi-formal English, but they can be difficult because they combine meaning, parallel structure, and subject-verb agreement.
One major rule is parallelism. The parts connected by these pairs should have the same grammatical form. For example, She wants either to study abroad or to work locally is parallel because both choices use the infinitive. He is neither tired nor distracted is also parallel because both words are adjectives. Learners often produce sentences like She either wants studying abroad or to work locally, which sound awkward because the two sides do not match grammatically.
Another issue is double negatives. Because neither is already negative, you should not add another negative verb in standard English. So Neither of them knows the answer is correct, but Neither of them doesn’t know the answer is incorrect. The same principle applies in neither…nor structures: Neither the manager nor the staff agree may look unusual to some learners, but it is grammatically complete without an extra negative word.
Finally, remember the agreement pattern with compound subjects. In sentences like Either John or his colleagues are presenting today, the verb agrees with colleagues, the nearer subject. In Neither the teachers nor the principal is available, the verb agrees with principal. This is one reason many teachers recommend rewriting awkward sentences when possible. If the structure feels hard to control, a clearer alternative is often better: The principal is not available, and the teachers are not available either.
5. What are the most common ESL mistakes with either, neither, and both, and how can I avoid them?
Several mistakes appear again and again across levels, from beginner writing to advanced professional communication. The first is confusing singular and plural verbs. Learners write Both is correct instead of Both are correct, or Neither of the answers are right in situations where formal English prefers is</
