1. 一般现在时：

(1)  am , is , are

I----am   you----are   he ----is   she----is  it----is

We----are   you----are   they---are  

(2)  I----work  he, she, it----works  we---work     

      you---work   they ---work  

  (3)  do , does

Do I work?     Does he (she, it ) work?

Do we work?   Do you work?   Do they work?

(4)  I do not work     He (She, it ) does not work  

We do not work     You do not work  

They do not work   don’t =do not  

doesn’t =does not

e.g. He always likes that.

I go to school every day.

Fire burns.

Knowledge is power.

Do you drive, John?

现在进行时:

    be + v-ing （现在分词）

(1)  I am working   Am I working ?   

I am not working    Am I not working ?

  (2)  He (she, it ) is working   Is he (she, it ) working?

He( she, it ) is not working  Is he (she , it )not working?

  (3)  We are working    Are we working?

We are not working   Are we not working?

  (4)  You are working    Are you working ?

You are not working   Are you not working?

  (5)  They are working    Are they working?

      They are not working    Are they not working ?

e.g.  The telephone is ringing, would you answer it, please?

What are you doing?

I’m not doing anything at present.

The sun is setting.

The river is constantly flowing into the sea.