`1,` He told them to open the door.

`+` Câu yêu cầu, đề nghị 

`-` S + told/asked/advised + sb + (not) to V0..

`2,` He asked her where she was going.

`-` S + told/asked/said(+O) + Wh-words + S + V(lùi thì) ... 

${\text{Lùi thì: }}$

`+` hiện tại tiếp diễn `->` quá khứ tiếp diễn

`-` you `->` she

`3,` He asked which way they had gone.

`-` S + told/asked/said(+O) + Wh-words + S + V(lùi thì) ... 

${\text{Lùi thì: }}$

`+`quá khứ đơn `->`  quá khứ hoàn thành

`4,` I told her to bring it back if it didn't fit.

`-` S + told/asked/advised + sb + (not) to V0..

${\text{Lùi thì: }}$

`+` hiện tại đơn `->` quá khứ đơn.