我是个学生。

I am a student.（主系表/一般现在时）

我正在游泳。

I am swimming.(现在进行时)

Are you swimming?

She is in the classroom. （主系表/一般现在时）

She is reading.

Is she reading?

They are good friends.

They are eating lunch.

Are they eating lunch?

练习：

1、我是快乐的。I am happy. Are you happy?

2、我正在喝咖啡。I am drinking coffee.

Are you drinking coffee?

3、他很生气。He is very angry. Is he very angry?

4、他正坐在一棵树下。Is he sitting under a tree?

5、他们是同学。They are classmates.

Are they classmates?

6、他们正在打篮球。They are playing basketball.

Are they playing basketball?

Classes begin at half past eight.

Do classes begin at half past eight?

My mother works in a hospital.

Does your mother work in a hospital?

练习：

1、在夏天，我每日洗澡。

In summer, I have a bath everyday.

Do you have a bath everyday in summer?

2、太阳在东方升起。

The sun rises in the east.

Does the sun rise in the east?

混合练习（要求辨别“主系表”、“主谓”、“现在进行时”）： 

1、一头大象有个长鼻子。An elephant has a long nose.

Does an elephant have a long nose?

2、许多鸟正在空中飞翔。Birds are flying in the air.

3、狮子来自非洲。Lions are from Africa.

Lions come from Africa.

4、老虎来自亚洲。Tigers are from Asia.

Tigers come from Asia.

5、鱼在水里游。Fish swim in the water.

6、马匹正在草地上奔跑。

Horses are running on the grassland.

7、我们吃猪的肉。We eat pig meat.