`1.`The police asked Lisa which way they had gone.                                               

`2.`Lily said she couldn't call because he wasn’t at home then.

`3.` I told Bobby that he couldn't leave the window open all night.

`@`Kiến thức câu gián tiếp :

`+` S + asked (sb ) + Wh-ques + S + V ( đổi ngôi + lùi thì )

`+` S + told/said that S + V ( đổi ngôi + lùi thì )

`+` can `->` could

`+` now `->` then

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

1.The police asked Lisa which way they had gone. 

2.Lily said she couldn't call him because he isn't at home then. 

3.I told Bobby thật he couldn't leave the window open all night. 

Cả 3 câu đều là câu gián tiếp nên sau asked, said, told động từ lùi thì 

Now→then(câu gián tiếp)