Đáp án:
1. what/ man/ wearing/ when/ you/ see/ him
`→` What was the man wearing when you saw him?
2. we/ have/ dinner/ when/ light/ go out
`→` We were having dinner when the light went out.
Thì quá khứ tiếp diễn.
Áp dụng lần lượt:
Wh- question + Was/were + S + V-ing..
S + was/ were + V-ing ..