英语高中人教版必修4学案：Unit2 2.4含解析

Period 4语法专题课

学习目标

1.Understand the sentences in the reading passages containing the -ing form as the subject and object.

2.Remember the basic sentence patterns which contain the -ing form as the subject and object.This will help them understand some complex sentences.

呈现新知

Translate these two sentences.

1.学习英语很重要。

2.我喜欢学英语。

感受新知

Ⅰ.Find sentences in this reading passage containing the -ing form.Read these sentences and analyze them.

1.Finding ways to grow more rice has been his life goal.

2.He saw the great need for increasing the rice output.

3.Yuan Longping searched for a way to increase rice harvests without expanding the area of the fields.

4.He doesn’t care about being famous.

5.Spending money on himself or leading a comfortable life also means very little to him.

6.Just dreaming for things,however,cost nothing.

7.He awoke from his dream with the hope of producing a kind of rice that could feed more people.

Ⅱ.Let the Ss read aloud the sentences they picked out,think over and discuss with their classmates in the groups how each of these -ing forms is being used in the situation.

活动探究

the -ing form as the subject and object

1.作主语

动词-ing形式作主语时,句子有两种形式:

(1)动词-ing形式直接置于句首主语的位置上。

捉弄别人是我们万万不能做的。

is something we should never do.

学习新单词对我来说非常重要。

is very important for me.

(2)用形式主语it,把真正的主语——动词-ing形式移置句尾。但这种句子形式有一定的限制,作表语的只能是某些形容词或少数名词,如:useful,useless,good,fun;no use,worth。

和他争辩是没有什么用的。

is useless .

跟你在一起工作是令人愉快的事。

is pleasant .

归纳:常用-ing形式作主语的句型有:

It+be+a waste of time doing... 做……是浪费时间的。

It is/was worth/worthwhile doing... 做……是值得的。

There is no sense in doing... 做……没有道理。

There is/was no point doing... 做……无意义。

2.作宾语

动词-ing形式作宾语有两种情况:一是有些动词只能后接动词-ing形式作宾语;二是有些动词后既可接动词-ing形式也可接不定式形式作宾语。

(1)只能后接动词-ing形式作宾语的动词,常见的有avoid,consider,enjoy,keep,finish,suggest,dislike,risk,delay,escape,cannot

help,imagine,mind,miss,practice,cannot stand,put off,give up等。

你是否考虑过找一位挚友?

Have you one special friend?

晚饭后你想和我一起散步吗?

Do you with me after supper?

(2)既可接动词-ing形式又可接不定式形式作宾语的动词(短语),常见的有:begin,start,continue,like,love,prefer,try,mean,forget,remember,hate等。

①在动词forget,remember,regret之后,用动词-ing形式与不定式形式意义不同。动词-ing形式表示动作先于谓语发生,不定式形式表示后于谓语动作。

我记得我已把信寄了。

I remember .

我会记着去寄信的。

I’ll remember .

我真后悔没赶上那次报告会。

I regret .

我遗憾地告诉你,我不能接受你的建议。

I regret I can’t take your advice.

②在try,mean之后,意义各不相同,如try to do (设法),try doing (试着),mean to do (打算,有意要做),mean doing (意思是,意味着)。

我并不想让你生气。

I didn’t mean .

你的计划意味着要花费几个小时。

Your plan would mean .

③go on doing 和go on to do

go on doing继续做一直在做的事;go on to do接着做另外一件事。

请接着做这同一个练习。

Please go on the same exercise.

请做另外一个练习。

Please go on the other exercise.

3.作介词宾语

动词-ing形式可与介词一起构成介词短语

(1)介词+动词-ing形式

我向你道歉,刚才对你那样生气。

I apologize with you.

(2)动词+介词+动词-ing形式