either

determiner, pronoun

/ˈaɪðə(r)/, /ˈiːðə(r)/

/ˈiːðər/, /ˈaɪðər/

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one or the other of two; it does not matter which（两者中的）任何一个
- You can park on either side of the street.这条街两边都可停车。
- You can keep one of the photos. Either of them—whichever you like.你可以保留一张照片。两张里任选一张，你喜欢的就行。
- There are two types of qualification—either is acceptable.有两种资格证明，任何一种都可以接受。
Grammar Point neither / either
neither / either
- After neither and either you use a singular verb:neither 和 either 后用单数动词：
  Neither candidate was selected for the job.申请这个工作的两个候选人都未获选。
- Neither of and either of are followed by a plural noun or pronoun and a singular or plural verb. A plural verb is more informal:neither of 和 either of 后接复数名词或代词加单数或复数动词，用复数动词较非正式：
  Neither of my parents speaks/speak a foreign language.我的父母都不会说外语。
- When neither… nor… or either… or… are used with two singular nouns, the verb can be singular or plural. A plural verb is more informal. neither ... nor ... 或 either ... or ... 与两个单数名词连用时，谓语动词可用单数或复数；用复数动词较非正式。
each of two（两者中的）每个，各方
- The offices on either side were empty.两边的办公室都是空的。
- There's a door at either end of the corridor.走廊两端各有一道门。

Word OriginOld English ǣgther, contracted form of ǣg(e)hwæther, of Germanic origin; ultimately related to aye and whether.

adverb

/ˈaɪðə(r)/, /ˈiːðə(r)/

/ˈiːðər/, /ˈaɪðər/

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used after negative phrases to state that a feeling or situation is similar to one already mentioned（用于否定词组后）也
- Pete can't go and I can't either.皮特不能去，我也不能。
- (especially North American English, informal) ‘I don't like it.’ ‘Me either.’ (= Neither do I).“我不喜欢这个。” “我也不喜欢。”
either… or…
used to show a choice of two things（对两事物的选择）要么…要么，不是…就是，或者…或者
- Well, I think she's either Czech or Slovak.嗯，我看她不是捷克人就是斯洛伐克人。
- I'm going to buy either the blue one or the red one—I can't decide.我打算买蓝色的还是红色的——我不能决定。
- Either he could not come or he did not want to.他要么是不能来，要么就是不想来。
Topics Preferences and decisionsa2
used to add extra information to a statement（补充时说）而且
- I know a good Italian restaurant. It's not far from here, either.我知道一家很好的意大利餐馆，而且离这儿不远。

compare or

Word OriginOld English ǣgther, contracted form of ǣg(e)hwæther, of Germanic origin; ultimately related to aye and whether.

Grammar Point neither / eitherneither / either

After neither and either you use a singular verb:neither 和 either 后用单数动词：
- Neither candidate was selected for the job.申请这个工作的两个候选人都未获选。
Neither of and either of are followed by a plural noun or pronoun and a singular or plural verb. A plural verb is more informal:neither of 和 either of 后接复数名词或代词加单数或复数动词，用复数动词较非正式：
- Neither of my parents speaks/speak a foreign language.我的父母都不会说外语。
When neither… nor… or either… or… are used with two singular nouns, the verb can be singular or plural. A plural verb is more informal.neither ... nor ... 或 either ... or ... 与两个单数名词连用时，谓语动词可用单数或复数；用复数动词较非正式。

either

Ways of adding extra information: namely, incidentally, furthermore...