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动词不定式可与哪些疑问词连用,它的否定形式是什么,不定式符号在什么情况下可以省略或保留?大家都搞清楚了吗?
1. 动词不定式与疑问词连用:疑问词+ to do sth
疑问词:how, how many/ much/often/soon/long/far, where, whether, what, who, which, whom等。(if和why不与to do连用)
Paul knows who ( ) (talk) to for help.
Sandy wants to know where ( ) (meet) his friends.
2. 动词不定式否定形式
很多同学经常犯这样的错误,在不定式前加didn’t, don’t, doesn’t等。
其实我们可以这样来记:不定式的否定式,有to无to都一样,就把not放在前。
He told me ( ) (not stay) here.
Li Lei tried to make the baby ( ) (not cry) any more.
3. 动词不定式符号
(1) 动词不定式符号省略的情况
两个或两个以上的不定式并列时,第一个不定式符号不能省略,其余的可省掉to。两者有对比关系时,to不能省略。如:
Edison’s mother taught him to write and read.
I haven’t decided to go home or to go to the cinema.
(2) 省掉不定式而保留动词不定式符号to的情况
Don’t talk unless you’re asked to.
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