Công thức thì HTTD 

(+) S + am/is/are + Ving 

(-) S + am/is/are + not + Ving 

(?) Am/Is/Are +S +Ving? 

I + am

S số ít, he, she, it + is

S số nhiều, you ,we, they + are

DHNB: now, right now, (!), at present, at the moment,.....

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1. His father isn't talking on the phone.

2. My grandpa isn't listening to music.

3. Father and mother aren't playing with the cat.

4. The boys aren't drinking Coke.

5. Your mother isn't sleeping

`color{orange}{~LeAiFuRuiHuiBao~}`