3.Many city kids look forward to visiting the countryside.

4.Not all students enjoy working in the fields.

5.They started producing hybrid rice in 1974.

6.I remember meeting the scientist while he was in Beijing last time.

Step 4 Grammar

T:Today, we are going to learn the v.-ing as a noun.So at first who can tell me what a noun can be used as in a sentence?And please give me some examples.

S:It can be used as subject.For example:Smoking is harmful to our health.

T:Now I think you have known how to use the v.-ing as subject.But how about others?

S:It can also be used as object.For example:I have forgotten seeing this film.

T:You are right.The v.-ing form can be used as object, too.Now let's come to know more about it.

T:Very good.(The teacher may give a systematical explanation of the grammar.)

　　　　　　　　　　　　　　　Grammar动名词

　　一、概述

　　和不定式一样, 动名词也是非谓语动词的一种, 它通常由动词原形加-ing构成。动名词有主动和被动两种语态, 有一般式, 完成式和进行式三种形式。如下表所示:

主动 被动 一般式 doing being done 完成式 having done having been done 完成进行式 having been doing 无 　　动名词仍保留有动词的特征, 可以和自己的逻辑主语、宾语和状语等构成动名词短语。动名词具有名词的功能, 在句中可以充当主语、宾语、表语、定语等成分。

　　二、动名词的时态和语态形式

　　1.动名词的时态形式

　　①一般式

　　动名词的一般式表示动作或状态与谓语动词的动作同时发生, 或者表示一种无时间性限制的经常性、习惯性的动作或状态。

　　He enjoys writing letters in English.

他喜欢用英语写信。