`1.` He asked me what I was going to plan for my vacation the next month

`2.` She asked him where he had had a class reunion the week before 

`3.` Ba's uncle asked him when he would come back his hometown

`4.` They asked us how many cars our company had sold the month before 

`5.` He asked her how long it took her to go to Singapore by plane

*Wh - question: S asked + (O) + question word + S + V_lùi thì

*Lùi thì:

Quá khứ đơn → Quá khứ hoàn thành

Hiện tại đơn → Quá khứ đơn

Hiện tại hoàn thành → Quá khứ hoàn thành

Hiện tại tiếp diễn → Quá khứ tiếp diễn

Quá khứ tiếp diễn → Quá khứ hoàn thành tiếp diễn

Hiện tại hoàn thành tiếp diễn → Quá khứ hoàn thành tiếp diễn

will → would

can → could

may → might 

must → had to

shall → should

is/ am/ are going to → was/ were going to