Công thức thì HTHT

(+) S + has/have + V3/ed 

(-) S + has/have + not + V3/ed 

(?) Has/Have + S+ V3/ed?

DHNB: before, since + mốc thời gian, for + khoảng thời gian, yet, already, just,....

Công thức thì QKĐ (V: to be)

(+) S + was/were + ... 

(-) S + was/were + not ... 

(?) Was/Were + S ... ? 

S số ít, I, he, she, it + was

S số nhiều, you, we ,they + were

Công thức thì QKĐ (V: thường)

(+) S + V2/ed 

(-) S + didn't + V1 

(?) Did + S+ V1?

DHNB: ago, last (year, month ...), yesterday, in + năm QK, ...

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

1. Have you ever seen

DHNB: ever (HTHT)

2. hasn't checked

DHNB: yet (HTHT)

3. did you last phone 

DHNB: last, ago (QKD)

4. have eaten

This / It is the first time +S+ has/have + V3/ed 

5. have used

DHNB: for a long time (HTHT)

6. have just visited / was 

DHNB: just (HTHT)

7. haven't seen 

DHNB: since (HTHT)

8. began / was

QKD + when + QKD 

9. has been / got 

HTHT + since + QKD 

10. Have you ever been / went 

DHNB: ever (HTHT), ago (QKD)

`color{orange}{~MiaMB~}`