Give students several minutes to fill in the form.

　　Suggested answers:

形式 时间概念 语态 to do/do 与谓语动词同时发生或发生在谓语动词之后 主动 to be doing 与谓语动词同时发生, 动作在进行 主动 to have done 发生在谓语动词之前 主动 to be done 与谓语动词同时发生或发生在谓语动词之后 被动 to have been done 发生在谓语动词之前 被动 　　Let students read the above sentences silently and try to understand different types of infinitive and can use them correctly.

　　Option Two

　　Show the grammar rules on the screen and let students understand them.

　　不定式的各种形式

　　动词不定式是一种非限定动词, 仍具有动词的一般特征, 有一般式、进行式、完成式。现分别介绍如下:

　　1. 动词不定式的一般式: to do/do

　　I am glad to see you here.

　　很高兴在这儿见到你。

　　She decided not to accept his present.

　　她决定不接受他的礼物。

　　To love and to be loved is the greatest happiness of life.

　　有所爱而且也被人爱是人生一大幸福。

　　2. 动词不定式的进行式: to be doing

　　It is wrong to be always thinking of yourself.

　　老是考虑你自己是错误的。

　　You don't need to be working in such a big hurry, for there's plenty of time.

　　你现在不必这样匆匆忙忙地干, 有的是时间。

　　The students pretended to be listening to the teacher carefully.

　　学生们假装在专心听老师讲课。

　　3. 动词不定式的完成式to have done

　　I'm sorry to have troubled you so much.

　　对不起, 给你添了这么多麻烦。

　　He is said to have been living here for twenty years.

　　据说他已经在这儿住了20年时间了。

　　It is a great honor to have been invited to visit this country.

　　应邀来这个国家访问我感到很荣幸。

　　I feel it an honor to have been given a chance to study here.

　　有机会来这里学习我感到非常荣幸。

　　4. 不定式的复合结构

　　It is not hard for one to do a bit of good. (主语)

　　 一个人做点好事并不难。

　　This problem is for you to deal with. (表语)

这个问题该由你来处理。