either 和 or 一起使用作并列连词,格式为 either ... or ..., 意为“要么……要么,不是……就是,或者……或者”,连接两个并列的单词,短语或句子,例如:either + 名词或短语 + or + 名词或短语,例如:I think she's either Russian or Polish.I left it either at home or in the car.I'm going to buy either a camera or a DVD player with the money.You can stay either with me or with Janet.either + 句子 + or + 句子,例如:Either he could not come or he did not want to.Either we go by train or we rent a car. Which do you prefer?Either you leave now or I call the police!We can either pre- or post-date the document. I don’t mind.二、谓语形式
1、当连接的两个并列主语都为单数形式,那么谓语动词用单数,例如:
Either Mark or Dawn is at the function.Either Dickens or Thackeray was a panderer to the public taste.2、当连接的两个并列主语中至少有一个是复数形式,那么谓语动词用复数,例如:Either the lawyer or the detectives are able to follow the sequence of events.There were either cakes or ice-cream at the party.Either the firemen or the policemen know him.3、连接两个并列主语时,谓语动词采用“就近原则”,即谓语的单复数形式根据最近的主语来决定,但并不是所有的语法惯例都遵循这个原则,例如:Either you or I am to go.
要么你去,要么我去。
Either he or you are right.
要么他对,要么你对。
三、either ... or ... 的否定式可以是 not either ... or ..., 也可以是并列连词 neither ... nor ...,例如:
He didn’t either write or phone.
他既没写信又没打电话。
解析:此句等于 He neither wrote nor phoned.
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