`1.` I don't know what to do.

`2.` Could you tell me where to find more information about this?

`3.` He's not sure when to start the computer.

`4.` They wondered how to deal with this problem.

`----------------`

`-` Cấu trúc "Wh-q `+` to V-inf" `:`

`->` S `+` V `+` Wh-q `+` S `+` ĐTKT (should/can/ ...) `+` V-inf `+` ...

`=` S `+` V `+` (O) `+` Wh-q `+` to V-inf 

`+` Chúng ta thường sử dụng các động từ ask, wonder, (not) be sure, have no idea, (not) know, ... trước từ để hỏi `+` to V.