`1` Were you having dinner at 7 o'clock yesterday evening?

`2` Were you doing your homework at 8 o'clock yesterday evening?

`3` Were you watching a film at 9 o'clock yesterday evening?

`4` What should we do to help protect the environment?

`5` Were they having a discussion about natural disasters at 9 a.m. yesterday?

`6` Was he watering the flowers in his garden last Sunday when the tornado came?

`7` The bus schedule says that there is a bus to Aeon at 10:05.

`8` Did I learn a lot about wildlife after visiting Cuc Phuong National Park last week?

`-` Quá khứ tiếp diễn dạng câu hỏi : Was/were + S + V-ing + O`?`

`-` Quá khứ đơn dạng câu hỏi : Did + S + V0 + O`?`

`-` Động từ khuyết thiếu : Wh-question + modal verbs + S + V0 + O`?`