现在进行时课堂
2008-04-10钟美云许振铎
钟美云 许振铎
Hello, boys and girls!本单元我们要学习的语法重点是现在进行时,下面让我们开始今天的“现在进行时”课堂吧!
◆知识网络:
现在进行时表示现在或现阶段正在发生或进行的动作或者存在的状态。由“助动词be(am, is, are)+动词的现在分词(v-ing)”构成。其中的am, is, are在人称和数上与主语保持一致。如:
He is doing his homework now. 他正在做家庭作业。
◆句式结构:
★肯定式:主语+am/is/are+v-ing
★否定式:主语+am/is/are+not+v-ing
★一般疑问式及其回答:
Am/Is/Are+主语+v-ing?
Yes, 主语+am/is/are.
No, 主语+am not/isnt/arent.
★特殊疑问式:特殊疑问词+am/is/are+主语+v-ing?
◆判定方法:
1.现在进行时在多数情况下是通过now来判定的。如:
Steve is playing soccer now. 史蒂夫正在踢足球。
2.以动词“Look!”,“Listen!”等开头的句子,提示我们说话时动作正在进行,应该用现在进行时。如:
Look! They are swimming in the river. 看!他们在河里游泳。
3.描述图片中人物的动作时常用现在进行时,以示生动。如:
Look at the picture!The children are skating on the lake.
看这幅画!孩子们正在湖面上滑冰。
4.通过前后的语言环境、时间等来说明动作发生的时间,也可由特定的语境来表达。如:
Lily is writing. Tom, what are you doing?
莉莉在写字。汤姆,你在干什么?
◆句式转变:
1.由肯定句变否定句时,要在be后加not。如:
She is working now.→She isnt working now.
2.由肯定句变一般疑问句时,要将be提到句首。肯定答语为:Yes, 主语+be.,否定答语为:No, 主语+be+not.。如:
Are you playing basketball now?
→Yes, we are. (No, we arent.)
3.由肯定句变成特殊疑问句时,要看划线部分的位置,主要有以下几种情况:
(1)对主语提问时要用who。例如:
He is listening to the teacher.→Who is listening to the teacher?
(2)对动作提问时要用what,原句中的现在分词要改为doing。例如:
She is watching TV.→What is she doing?
(3)对宾语提问时仍用what。例如:
We are cleaning the desks now.→What are you cleaning now?
(4)对时间状语提问时用when。例如:
I am writing now.→When are you writing?
◆特殊用法:
go, leave, come等表示位移的动词,通常用现在进行时表示将要发生的动作。如:
I am coming, Mum.(我马上就来了,妈妈。)
练习:(找出句子中的错误并改正)
1. 我正在做家庭作业。
I doing my homework.
2. 吉姆正在穿衣服。
Jim is puting on his clothes.
3. 看!他们在做游戏。
Look, they play games.
4. 这些日子你在做什么?
What do you do these days?
5. 现在我想和你一起去。
Now I am wanting to go with you.
6. 别担心,我就来。
Dont worry. I come.
7. “她正在打扫教室吗?” “是的,她正在打扫教室。”
——Is she cleaning the classroom?
——Yes, shes.Key(3)