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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1.

(-) Children didn't plant more trees. 

(?) Did children plant more trees?

2.

(-) Tom wasn't a member of the Youth Club.

(?) Was Tom a member of the Youth Club?

3.

(-) The school wasn't closed due to the snow.

(?) Was the school closed due to the snow?

4.

(-) The organisation didn't provide shelter for the children.

(?) Did the organisation provide shelter for the children?

5.

(-) They weren't at school this morning.

(?)  Were they at school this morning?

6.

(-) Tom didn't go to the hospital to provide food two weeks ago.

(?) Did Tom go to the hospital to provide food two weeks ago?

7.

(-) The sidewalks weren't wet after the rain.

(?) Were the sidewalks wet after the rain?

8.

(-) I didn't start to work as a volunteer three years ago.

(?) Did you start to work as a volunteer three years ago?

9.

(-) They weren't in the library an hour ago.

(?) Were they in the library an hour ago?

10.

(-) Tom and his friends didn't go to orphanages to learn English yesterday.

(?) Did Tom and his friends go to orphanages to learn English yesterday?

`color{orange}{~MiaMB~}`