both/ either / neither
三者都是在谈到两个人或东西时用的。可用作代词、形容词、连词。
Ⅰ. 作代词时:both 两者都. either 两者中任何一个. neither 两者中任何一个都不。 作主语时,谓语动词用复数形式,可作同位语。而either 和 neither 则用单数形式,不可作同位语。如:
① Both of us are teachers.
② Either of you can do it.
③ Neither of the answerws is right. 两个答案都不对。
④ They both skate well. 他们两人都会滑冰。
Ⅱ. 作形容词时:both 修饰名词的复数形式。Neither 和 either修饰名词的单数形式。如:
① Neither film is very long.两部电影都不长。
② You may use either pencil. 你可用这两支笔中的任何一支。
③ Both pencils are blue. 两支铅笔都是蓝色的。
Ⅲ. 作连词时: neither 与nor 连用,既不也不; either 和 or 连用:或是或是 要么要么连接两个主语时,谓语动词遵循就近原则。而both 却与and 相连。连接主语时谓语动词用复数。如:
① Neither Jack nor I have seen the film.
杰克和我都没看过这影片。
② Either you or I am wrong.
不是你错就是你错。
③ Both John and Mike are good at swimming.
约翰和麦克都擅长游泳。
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