此句型表示“干某事花了某人一段时间。”其中的it是形式主语，后面的动词不定式（短语）才是真正的主语. =sb.spend some time on sth. (in) doing sth.
It took me half an hour to do the work. =I spent half an hour in doing the work.
8．…think／find + it + adj. + to do sth.
此句型中的it是形式宾语，不可用其它代词替代，形容词作宾语的补足语，后面的动词不定式（短语）才是真正的宾语。
eg.I find it useful to learn English well. (我发觉学好英语是很有用的)
find +宾语+名词 eg.I find him a good boy. 我发现他是个好男孩.
find +宾语+形容词 eg.I find the door open/closed. 我发现门开/关着
I find our bags filled with/full of presents. 我发现我们的包装满了礼物
9．What’s wrong with…?
此句型相当于What’s the matter/ trouble with…?后跟某物作宾语时，意为“某物出什么毛病了?”后跟某人作宾语时，意为“某人怎么了?”
What's wrongwith you? 你怎么啦?
What's wrongwith your watch? 你的手表有什么毛病?
10. 祈使句+and (那么)+陈述句
Go straight on and you’ll see a school. =If you go straight on, you’ll see a school.
祈使句+or（否则）+陈述句
Work hard, or you will fall behind the other students.=If you don’t work hard, you’ll fall behind the other.
11．too…to…'太…而不能' '太…以致于不'
经常与so…that…转换。 在so…that…复合句中，that后的句子是否定句时，常与简单句too…to…（太……而不能……）进行句型转换。
This colour TV is so expensive that we can’t afford it.=This colour TV is too expensive for us to buy.
The basket is so heavy that I can’t carry it.=The basket is too heavy for me to carry.
在so…that…复合句中，that后的句子是肯定句时，常与简单句…enough to…进行句型转换.
He is so clever that he work out the problem.=He is clever enough to work out the problem.
12. She used to be a Chinese teacher. 她过去是一位汉语老师。
[用法] used to + 动词原形，表示过去经常性的动作或存在的状态，含有现在不再如此之意。
[搭配] used to do的否定式可以是usedn’t to do或didn’t use to do.
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