概念不同

一般现在时表示现在的状态;表示经常的或习惯性的动作;表示主语具备的性格、能力等。现在进行时表示现在某一时刻或某段时间正在进行的动作或存在的状态。

结构不同

1. 一般现在时的结构(以肯定句为例)有以下几种形式:

⑴ 动词be第一人称单数用am,第三人称单数用is,其他的一律用are。例如:

I am a student. 我是个学生。
He is an American. 他是个美国人。
They are good friends. 他们是好朋友。

⑵ 动词have除了第三人称单数用has外,其他一律用have。例如:

He has two brothers. 他有两个兄弟。
We have English classes every day. 我们每天都上英语课。

⑶ 实义动词除第三人称单数在动词原形后加-s或-es外,其他一律用动词原形。例如:

His mother works in a hospital. 他母亲在一家医院工作。
Children like to play this game. 孩子们喜欢玩这种游戏。

2. 现在进行时的结构为:助动词be(am/is/are)+ v-ing形式。例如:

We are singing and they are dancing. 我们在唱歌,他们在跳舞。

时间状语不同

1. 一般现在时的时间状语通常为often,always,usually,sometimes,every day/week/month等。例如:

I get up at six every day. 我每天六点钟起床。
He often goes to school on foot. 他经常步行上学。
Sometimes they play football after school. 有时他们放学后踢足球。

2. 现在进行时的时间状语通常为now;有时有look, listen等词语提示。例如:

What are they doing now? 他们现在在干什么?
Look! The bird is flying in the sky. 看!鸟在空中飞行。


练习

用所给动词的适当形式填空。

1. Look!They ______(play) basketball over there.
　They______(play) basketball every afternoon.

2. She ______(look) like her mother.

3. Lily ______(like) watching TV. She ______(watch) TV every evening. But now she ______(not　watch) TV. She ______(read) an English book.

4. －Listen! Who ______(sing) in the next room?
　－I think it's Li Mei. She often ______(sing) in the next room. And she ______(sing) well.

Key:

1.are playing, play　2.looks 
3.likes, watches, isn't　watching, is reading 
4.is singing, sings, sings