Giúp với ạ

`Đáp` `án:`

1. didn't learn 

2. have had

HTHT + since + QKĐ

3. have waited

DHNB: for half an hour (HTHT)

4. haven't eaten / saw

HTHT + since + QKĐ

5. have written 

DHNB: up to now (HTHT)

6. went

DHNB: last year (QKĐ)

7. played

DHNB: yesterday afternoon (QKĐ)

8. Have you ever been

DHNB: ever (HTHT)

9. was / didn't like

10. has visited

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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, ...