1. was arriving - slept.
2. was going - were having.
3. was having - stopped.
4. was crossing - saw.
5. was seeing - was standing.
6. was reading - was learing - was doing.
7. was playing - came.
8. was - worked.
9. was sitting - saw.
* Cấu trúc thì quá khứ đơn:
- Với động từ “TO BE”:
(+): S + was/ were +…
(-): S + was/ were + not
(?): Was/ Were + S +…?
- Với động từ thường:
(+): S+V-ed/P2.
(-): S + did + not + V(nguyên thể).
(?): Did + S + V(nguyên thể)?
* Cấu trúc thì quá khứ tiếp diễn:
(+): S + was/were + Ving.
(-): S + was/were + not + Ving.
(?): was/were + S + Ving?
* When + past continous, simple past.
* While + past/ present continous, past/ present countinous.
