It is good exercise for us ________(walk)to school everyday.

2.It is +形容词(+for sb.)+to do sth.如：

It is not good for us_________ (watch) too much TV.

3.It is +形容词+of sb.to do sth.如：

It is kind of you ______( think) so much of us.难为你这样替我们着想。

类似用of的形容词有kind，nice，wise，foolish，careless, lazy, good, right, clever, silly, 等

(3) 形式宾语They found it impossible______(get) everything ready in time.

(4)做表语：主语+be +to do sth.此类句型中作

主语的中心名词通常是：duty，wish，hope，idea，plan，mistake，ambition, goal,等。如： My idea is_______( wait) in line.我的想法是排队等候。

(5) 主语+be+形容词+to do sth.如：I'm sorry____( hear) that your mother is ill.

(6)不定式作结果状语的句型有两种：

1.too+形容词/副词+to do sth.如：

Kate ran too slowly _______(catch) up with Rose.凯特跑得太慢，赶不上罗丝。

2.名词/形容词/副词+enough to do sth.如：

Have you got enough money ________( buy) a computer?你有足够的钱买台电脑吗?

(7)动词不定式在句中作定语常置于被修饰的成分(或词)的后面，其句型多为：

1.It's time to do sth.如： It's time_______( go) to school.该去上学了。

2.主语+have +sth.to do.如： I have nothing_______(worry) about.

(8)to能够代替不定式的内容。 在口语中，下文不定式的内容可承上文省略，但to不可省。这种用法常见于下列结构：have to ，would like(love) to，glad to等。如：

[考例] —Would you like to go to the cinema with us tomorrow?

—Yes，_____ .What time are we going to meet?('98浙江)

A.I would B.I would like C.I like to D.I'd like to

同学们，请你看看下面的10道题的空格处是不是都加上to呢?做完后你会“真相大白”

1.Why _____ go to the cinema with him? 2.Why not _____ wear a flower?

3.They would rather try and fail than _____ give up the plan.

4.You had better _____ leave here at once.

5.He could do nothing but _____ obey the order.(can’t but do sth.)

6.Can I help _____ carry it for you? 7.I'd like _____ come ，but I have no time.

8.He likes to stay with peasants and _____ work in the field with them.

9.I haven't decided to go or _____ stay.

10.It's necessary for us to read more and _____ have more practice.

Key: 1.× 2.× 3.× 4.× 5.× 6.to 7.to 8.×9.to 10.×/to

动名词

1.动名词由动词 + ing构成，否定形式为not doing，具有动词和名词的性质，在句中起名词作用，可作主语、宾语、表语和定语。

1)作主语。如： Seeing is believing.

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