has different grammatical functions, so it is natural for it to have different meanings. But technically it means one of the two. Generally, either is defined as 'both' or 'one.'

has different grammatical functions as well, so it has different meanings like 'either' does. It means none of the two. In general, 'neither' is defined as 'none' or 'not either.'

is used as a determiner before a singular countable noun with an affirmative verb to refer to something which agrees with both options being mentioned. 'Neither' is a negative marker and it can make a sentence negative on its own, therefore it does not need a negative verb.

is used as a determiner before a singular countable noun with a negative or affirmative verb, to talk about two choices. In this case, 'either' is distributive.

is used as a pronoun with an affirmative verb to mean 'not one' and 'not the other'. It is good to know that whenever we are using 'neither' as a pronoun no noun follows it, so it is directly followed by a verb.

is used as a pronoun with both negative and affirmative verbs to mean a choice of one or the other. As you know, it is not followed by a noun. In this function, 'either' is used to refer to people, things, or situations that are both possible, so as a result, it does not matter which.

is combined with a positive/affirmative verb and it comes before an auxiliary to mean 'too.' The structure is [neither + auxiliary verb + subject]. Sometimes there is a tendency to use plural verbs because of the nouns that were mentioned earlier, but using a singular verb with it is more common.

is combined with a negative verb and comes last in the sentence and it means 'too.' The structure is [subject + auxiliary verb + either]. Remember using a singular verb is more common even if we are talking about a plural noun. In this case, you put 'either' at the end of the second statement to emphasize that there is a connection between the two clauses which is correct for both.

'Me either' is considered informal as well as 'me neither', since 'I don't either' is considered formal. But are 'me either' and 'I don't either' the same? Here is the thing, 'me either' is used to confirm a positive sentence and 'I don't either' is used to confirm a negative sentence.

can be used as a conjunction, and as conjunctions do it connects two clauses that both, are not true or will not happen. The thing in this function is that 'neither' is followed by 'nor' to give two options. 'Neither' is used before the first item and other items would follow 'nor' instead.

can be used as a conjunction used to connect two clauses. It is important to know that 'either' is followed by the term 'or' in this case. The point is to use 'either' before the first option and others should follow 'or.' Remember in this function, 'either' can refer to individuals or both the alternatives.

Here are the differences in the table:

In standard English, 'neither' and 'either' are both followed by singular verbs; however, we can use them with plural verbs in spoken English. So there is always a tendency to use them with plural verbs, but it is not that common

We use 'neither of' and 'either of' when it is followed by pronouns and plural countable nouns which have determiners (my, his, the, these, those) before them. To be more clear it is said neither of and either of are used before pronouns and noun phrases.

We can use 'neither' and 'either' when we want to add another negative fact or idea to a conversation. 'Neither' and 'either' both can be used as a negative form of 'too.'