Giải giúp mình với ạ 

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, ...

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2. Did / have / did/ had 

3. did / go / went

4. Did / leave / didn't / left 

5. did / learn / learnt

6. Did / forget / didn't 

`color{orange}{~LeAiFuRuiHuiBao~}`