Đáp án:

1. We weren't in the stadium yesterday afternoon.

2. She didn't bring me a cup of tea.

3. He didn't know the truth.

4. The bird didn't fly to the south.

5. My grandfather didn't drink coffee.

6. They didn't build charitable houses for the poor.

7. I didn't send him the email that I couldn't come.

8. The kid didn't throw the ball to the man.

9. The boss didn't pay her a large amount of money.

10. He didn't read a book about history in the library. 

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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, ...