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动词不定式常用句型十三太保
(1) It takes / took / will take sb. some time / money to do sth.
某人花 / 花了/将花多长时间 /多少钱做某事 .
例句： It took me years of hard work to speak good English.
为了讲一口流利的英语 ,我花了多年时间刻苦操练 .
注意：句型表示某人做某事花费多少时间”常与Sb.spends +-段时间+(in) doing sth.互换。例如:It took me half an hour to do my homework yesterday.lspent half an hour in doing my homework yesterday.昨天我做作业花了半个小时的时间。
拓展：what it takes to do something 做某事的必备条件
Pact-ice is what it takes to learn English well.练习是学好英语的必备条件。
(2) It is + adj +for/of sb to do sth
例： Lincoln said that it was not right for the South to break away from the Union. 林肯说南方脱离联邦是不对的。
It was careless of Tom to break the cup.
注意事项：这个结构中，of的宾语是不定式的逻辑上的(或意味上的)主语，前面的形容词表示行为的性质，同时又指行为人的品质，这时，不能换用for。这个结构可用“人+be +(品性)形容词+不定式”来改写。例如:
It is very kind of you to do so.= You are very kind to do so.你这样做很好。
It was honest of him to tell you the truth. = He was honest to tell you the truth.他很诚实，告诉你了实话。
(3) Sb. have / has / had no choice/option/alternative but to do... 某 人 除 了做 别无选择 .
例 句 ： We had no choice but to take a taxi for we'd missed the last bus.
由于错过了最后一班公共汽车,除了乘坐的士,我们别无选择 .
(4) It's not /just like sb. to do sth. 的行为不 /正像某人的一贯作风 .
例 ： lt's not like Jim to be late for class. He regards time as the most important thing in life.
上课迟到不像吉姆的一贯作风 ,他把时间看作是生命中最重要的 .
(5) ．．．形容词／副词＋ enough to do sth．
例 ： I was fortunate enough to travel to South Africa. ．
(6) It pays to do something 做...是值得的。
例句： It pays to help others. 帮助别人是值得的。
(7) It cost sb some time/money to do sth
例 ： It must cost a good deal to live here.住这儿一定会花很多钱的。
(8) do all sb could to do sth / do what sb could to do sth/
do everything sb could to do sth
例 ： They were doing everything they could to help the fatherland.
他们在尽最大努力去帮助祖国。
(9) It is hard to imagine/ say 很难想象 /说
例 ： It is hard to imagine how Edison managed to work twenty hours each day. 很难想象爱迪生每天是怎样工作 20小时的。
It's hard to say whether the plan is practical.
这个计划是否实际很难说。
（10）It is up to sb to do something 该由某人做某事。
It's up to you to decide whether to stay or not. 是走是留由你自己来决定。
too +ready/eager/anxious/willing/easy to do...非常...做某事
这个结构形式上类似“to....to.”结构，但不表示否定意义，一定要记住中间的常用形容词。
例如:Lesson Two is too easy to learn.第二课学起来太容易了。
We are too ready to help you.我们乐于帮助你。
（12）连接代词/副词+不定式
不定式短语，在某些情况下，前面可以带一个连接代词或副词，在句中可以作主语、宾语、表语、状语、同位语等。例如:
How to go there hasn’t been decided yet. 如何去那儿还没决定。
We'd better find out where to put it.我们最好了解-下应放在哪里。
The question is when to start.问题是什么时候出发。
had no idea which one to choose.我不知道选哪一个。
（13）动词+ it +形容词/名词+ 不定式
用it 做形式宾语，代替不定式在不定式用作宾语，当后面有补足语的情况下，不定式要放在句尾，用it 做形式宾语。常用动词有六个：make, consider, feel, find believe,think.
例如:
They found it impossible to get everything ready in time.
他们发现不可能把一切按时准备好。
I consider it better not to go.我认为还是不去为好。

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