Unit 1 Living well Grammar(I)学案

导学目标 不定式to do句法功能

自主合作探究

I. 不定式作主语

1) To lean out of the window is dangerous. 把头伸出窗外是危险的。

2) It is not good for you to smoke so much. 你抽这么多烟对身体很不好。

归纳拓展：

1. 表示具体动作、将来的动作或者表示一件未完成的事。

2. 不定式作主语，其位置有两种情况：

1) 不定式放在句首。

2) 使用形式主语it，然后把真正的主语放在后面, 常见it作形式主语的句型：

①It+be+名词+to do sth...常见名词有：duty, pleasure, mistake, turn, good(bad) manners ....

如：It's our duty to obey the laws.

②It+be+形容词+for sb. to do sth. 常见形容词有：convenient, dangerous, easy, hard, useful, important, necessary, possible, unusual, interesting等。

如：It's not very useful to read the whole book.

③It+be+形容词+of sb. to do sth. 常见形容词有careless, clever, foolish, honest, kind, lazy, silly, stupid, wise, generous等。

如：It is very clever of you to find him here.(=You are clever to find him here.)

即景活用：句型转换

1) To complete the 30­storied building in one year was quite a difficult task.

　→_________________________________________________________.

II. 不定式作宾语

1) She pretended not to see me when I passed by.

2) I can't afford to buy a car.

3) I want to know what to do next.

归纳拓展：

1. 不定式作宾语的动词有：afford, agree, arrange, aim, attempt, choose, decide, desire, demand, determine, expect, fail, hope, wish, long(渴望), want, offer, promise, pretend, plan, refuse, manage等。