1

---肯定句

基本結(jié)構(gòu)：主語+ am/is/are + 現(xiàn)在分詞 + ……

I am watching TV now.

I am speaking with him on the phone.

They are travelling in Europe now.

Look! He is riding a roller coaster.

2

---否定句

基本結(jié)構(gòu)：主語+ am/is/are + not +現(xiàn)在分詞+ ……

I am not studying

She isn’t playing the guitar.

Joe isn’t running in the park.

We aren’t enjoying our trip.

They are not playing football.

3

---一般疑問句

基本結(jié)構(gòu)：Am/Is/Are + 主語 +現(xiàn)在分詞 + …… ?

Are they playing tennis now?

Yes, they are. / No, they aren’t.

Is she still studying abroad?

Yes, she is. / No, she isn’t.

Look! Is a bird flying in the sky?

Yes, it is. / No, it isn’t.

4

---特殊疑問句

基本結(jié)構(gòu)：疑問詞+ am/is/are + 主語 +現(xiàn)在分詞 + …… ?

What are you reading now?

What are you doing now?

I’m observing the structure of the plane.

What course are you taking at weekends?

I’m taking an English course.

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