1. is studying

2. is raining

3. is coming

4. isn't drinking

5. aren't sleeping

6. aren't singing

7. Is/teaching

8. Are/playing/are

Cấu trúc Thì HTTD:

(+) S + Be + Ving

(-) S + be + not + Ving

(?) Be + S + Ving...?

→ Yes, S + be

→ No, S + be not

is not = isn't

are not = aren't

DHNB: now, at the moment, right now, at present, at this time, Look!..., Listen!...

@Càng 

HTTD 
S  + be + V-ing

S + be not + V-ing

Be + S + V -ing

DHNB : 

+ Now

+ At the moment

+ At present

+ look !

+ listen !

+ ..

1 : is studying

2 : is raining

3 : is coming

4 : isn't drinking

5 : aren't sleeping

6 : aren't singing

7 : Is - teaching

8 : Are - playing - are