=>

13. was

-> when she was young (QKĐ, S V2/ed)

14. met/was doing

-> QKĐ while QKTD: hành động đang diễn ra thì hành động khác xen vào trong quá khứ

15. were playing/decided

-> while QKTD, QKĐ 

Bài 3/

1. was having/rang/answered

2. saw/was sitting/reading

3. was walking/hurt

4. burnt/was cooking

5. fell/was painting

6. was reading/heard

7. Were you watching

8. was waiting/arrived

9. wasn't driving/happened

10. broke/was doing/slipped

Thì QKĐ: 

Với động từ thường:

(+) S V2/ed

(-) S didn't V

(?) Did S V?

Với động từ tobe:

(+) S was/were...

(-) S was/were not...

(?) Was/Were S...?

Thì QKTD

(+) S was/were Ving

(-) S was/were not Ving

(?) Was/Were S Ving?

When QKTD, QKĐ

While QKTD, QKĐ