Units7-8复习要点

　　重点句型

　　1.--Would you mind moving your bike?

　　--Not at all. I’ll do it right away.

　　2.--Could you please take out the trash? --Sorry, I’ll do it right away.

　　3.--What should I get my mom? --How about a CD?

　　--No, that’s too cheap.

　　4.--What’s the best present you have ever received? --A bike.

　　不定式的语法功能：

　　1. 作主语：

　　To finish the work in ten minutes is very hard.

　　十分钟内完成这项工作是很困难的。

　　To lose your heart means failure.

　　失去信心就意味着失败。

　　动词不定式短语作主语时，常用it作形式主语，然后将不定式置于句末。例如上面两句可用如下形式：

　　It is very hard to finish the work in ten minutes.

　　It means failure to lose your heart.

　　2. 作表语，表示主语的“职业，职责或性质”等：

　　Her job is to clean the hall. 她的工作就是打扫大厅。

　　He seems to know everything about this thing.

　　他似乎对这件事情什么都知道。

　　3. 作宾语：

　　常与不定式做宾语连用的动词有：want, hope, wish, ask, (would)like, offer, fail, plan, learn, pretend, refuse, manage, help, agree, promise, (would)prefer。如果不定式(宾语)后面有宾语补足语，则用it作形式宾语，真正的宾语(不定式)后置，放在宾语补足语后面。

　　He found it important to study English.他发现学习英语很重要。

　　动词不定式也可充当介词宾语。

　　I have no choice but to stay here.

　　除了呆在这儿我没有别的选择。

　　He did nothing last Sunday but repair his bike.

　　上周日他除了修他的自行车外什么也没做。

　　4. 作宾语补足语，用以说明宾语的性质，身份，特征和行为等情况：

　　以下动词常跟动词不定式充当宾语补足语：want, wish, ask, tell, order, permit, help, advise, persuade, allow, prepare, cause, force, call, wait for, invite.

　　I told Jeff to give up his bad habits,but he wouldn’t listen.