Công thức thì HTĐ (V: tobe)

(+) S + am/is/are ..

(-) S + am/is/are + not .. 

(?) Am/Is/Are + S + ... ? 

I + am

S số ít, he, she, it + is

S số nhiều, you ,we, they + are

Công thức thì HTĐ (V: thường)

S số ít, he, she, it 

(+) S + Vs/es

(-) S+ doesn't + V1 

(?) Does +S +V1?

S số nhiều, I, you, we, they

(+) S + V1 

(-) S+ don't + V1 

(?) Do + S+ V1? 

DHNB: always, usually, sometimes, often, never, seldom,....

Công thức thì HTTD 

(+) S + am/is/are + Ving 

(-) S + am/is/are + not + Ving 

(?) Am/Is/Are +S +Ving? 

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

-------------------------------------------------

1. aren't watching

DHNB: now (HTTD)

2. study 

DHNB: five periods a week (HTD)

3. isn't sleeping

DHNB: at the moment (HTTD)

4. does / do 

DHNB: every morning (HTD)

5. is playing

6. doesn't play

DHNB: every weekend (HTD)

7. Is / always wearing

8. is wearing

9. play
DHNB: sometimes (HTD)

10. opens

11. don't think

12. is trying

13. are talking

14. close

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