đề bảo chia thì QKĐ nha 

(+) S + v-ed / v2 + ...

(-) S + didn't + V nguyên mẫu

(?) Did + S + V nguyên mẫu

1 where did you put my keys

2 luke didn't phone me last night 

3 did they stay at home on sunday

4 i finished my project yesterday

5 the flim wasn't very good

6 emma bought a new computer last week

7 why did he sell his car ?

1.Where did you put my keys?

2.Luke didn't phone me last night.

3.Did theu stay at home on Sunday?

4.I finished my project yesterday.

5.The film wasn't very good.

6.Emma bought a new computer last week.

7.Why did he sell his car?

Thì quá khứ đơn:

Khẳng định: S+Ved (hoặc bất quy tắc nếu có)+O

Phủ định: S+didn't+V+O

Nghi vấn: Did+S+V+O?