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一、不定式的固定搭配：
（1）It’s difficult (important, necessary) for sb.+ to do.
（2）It’s kind (good, friendly, polite, careless, rude, cruel, clever, foolish, brave) of sb.+ to do.
（3）It takes one’s time / money.+ to do.
二、动词后固定接to do的情况
1、 decide to do sth. , learn to do sth. want to do sth. wish/ hope/ expect to do sth.
2、 refuse to do sth. , manage to do sth. care to do sth. pretend. to do sth.
3、offer / afford to do sth. promise/allow to do sth. choose to do sth.
plan/ prepare to do sth. be likely to do
4、 agree to do sth. ask/beg to do sth. help to do sth. happen to do sth. long to do sth. fail to do sth. order to dosth. cause to do sth.
三、动词后带省略to的不定式情况：
1、Why not ________________
改错：Tom ,why not having a rest and sleep for a while.
2、would rather ______________
改错：On weekdays , Sara would rather to take a bike to
3、 prefer _____ rather than _____
改错：Whenever I meet the problem, I prefer to think first rather than to turn to help.
4、had better (not) _____ sth.
5、let sb.________
6、can’t but_______=cannot choose but _______
= can’t help to do.
四、 besides, except, but在不定式中的用法
besides, except, but。表示：__________的意思
（这三个介词后可以接(to) do .至于to是保留还是省略取决于其前是否有实义动词do, 遵守有do 则无to,无do则有to.）
练习：
1、Don’t complain, you’d better manage (manage) to clean you dress first.
2、Do you know the thief preferred to be put (put) into prison rather than tell (tell) the police who was the ringleader.
3、He was pretending to do(do ) his homework when I passed by.
4、 I’m sorry to have given(give) you so much trouble.
5、 Research found that children who drank mainly soda were more than twice as likely as those who drank no soda to show（show）signs of aggression.
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