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if引导的条件状语从句用动词原形还是非谓语动词

作者: admin来源: 网络文章 时间: 2020-04-20

请看下面的句子,空格处应填动词原形还是非谓语动词

If they don't understand it the first time, _________ over it again until they do.

A. going B. to go C. gone D. go

【分析】此题正确答案选D,其余几项均有可能被误选。空格前 if 引导的是一个条件状语从句,而在空格处无论是填A、B或C,它都是一个非谓语动词短语,而不是一个句子,这样一来,整个句子没有主句,从而导致结构不完整。若选D,则 go over it again until they do 则是一个句子(祈使句),在此用作主语。又如:

(1) If he likes to eat it, _________ him some more.

A. give B. giving C. given D. to give

(2) If anyone calls, _________ them I'm not at home.

A. tell B. telling C. told D. to tell

(3) When your mother comes back, _________ her to come to school at once.

A. ask B. asking C. asked D. to ask

(4) While the baby is sleeping, _________ your work as soon as possible.

A. finish B. finishing C. finished D. to finish

答案均选A,空格前分别为 if, when, while 引导的状语从句,空格处填动词原形,构成祈使句,用作句子主语。

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