如何有礼貌地提出请求很重要。

　　[即时训练2]　句型转换/完成句子

　　①To give up smoking is right.

　　→It is right to give up smoking.

　　②做早操有利于我们的健康。

　　To do morning exercises is useful for our health.

　　③对我们来说，很难在一刻钟内写完这篇作文。

　　It is difficult for us to finish writing the composition in a quarter of an hour.

　　2．不定式作宾语

　　不定式可以放在及物动词或及物动词短语的后面作宾语。下面的口诀可以帮助你记忆常见的这类动词：

　　三个希望(hope，wish，want)两答应(agree，promise)；两个要求(demand，ask)莫拒绝(refuse)；设法(manage)学会(learn)做决定(decide)；不要假装(pretend)在选择(choose)。

　　I hope to have my own bike.

　　我希望有辆我自己的自行车。

　　My father came down and demanded to know what was going on.

　　我父亲从楼上下来要求知道正在发生什么事情。

　　[名师点津]　

　　如果不定式作宾语且有自己的补语，常用it作形式宾语，而把真正的宾语放在后面。常用it作形式宾语的动词有：believe，consider，feel，find，know，make等。

　　I know it impossible to finish so much homework in one day.

　　我知道在一天内完成这么多的作业是不可能的。

　　[即时训练3]　单句语法填空

　　①I decided to go(go)to the countryside on vacation.

　　②I think it unnecessary to argue with him about it.

　　③Would you like to go(go)with me or would you rather stay (stay) at home?

3．不定式作宾语补足语