This can be resolved rather simply. Just remember that ¨either¨will be used with choices. Either is always followed by or with choices or selections. Would you like either the red one or the black one? Either she goes or I do, but one of us must leave the party. Neither you will use to negate or denying. Neither is always followed by nor in options or selections. He is neither happy nor sad. I do not want neither the chocolate ice cream nor the vanilla. I hope this helps. Let me know if you have any questions.

neither = not either

“either” represents one of the two or any, “neither” indicates none of the two. Both are tangents in comparison. ‘Either’ is considered to be the positive pronoun, adverb, conjunction or adjective as per its usage. It provides the audience with the knowledge of expecting in advance two or more possibilities during the conversation or dialogue. On usage either is always paired with ‘or’. When there are more than two options then usage of ‘any’ is preferred in that context. As an adjective, ‘either’ can be used only between two options hence it is one or the other, or both of them. For example, as an adjective it is used as “Either side of the river”. As a pronoun, it is one or the other hence sample usage is “Both the cars are going home, you can drive in either of them.” As a conjunction it gives a possibility of choice, therefore it can be used as “Either email or watch TV.” Though it is positive in usage, as an adverb it follows a negative frame of words like “If you don’t play, the dog won’t play either.” On the other hand, ‘neither’ is considered to be a negative pronoun, adjective, conjunction and adverb. Always paired with ‘nor’ it sets the platform for the audience to not consider any of the possibilities provided during the conversation. As a pronoun, ‘neither’ is used as “Neither of the pups are of a pure breed” while as an adjective it is adapted as “Neither flowers are fresh.” As a conjunction, ‘neither’ may be used as “Neither of the reports can be trusted.”

This is also used to show that two things are equal, but in a negative way. So if John is not Chinese, and Mary is also not Chinese, we can say: John isn't Chinese, and Mary isn't either. or John isn't Chinese, and neither is Mary. Here we would use "isn't" in both clauses when we end with "either." When we use "neither" it already indicates negative, so we change the auxiliary verb to its positive form ("neither is").

i'm not sure what he studies it's either english or german. the grass is neither pink nor blue - it is green.