`1.` visited his

`-` lùi thì: HTĐ `->` QKĐ

`2.` they had seen

`-` lùi thì: QKĐ `->` QKHT

`3.` they had not caught

`-` lùi thì : HTHT `->` QKHT

`4.` he could help him 

`-` can `->` could

`5.` had

`-` lùi thì: HTĐ `->` QKĐ

`6.` knew

`-` lùi thì: HTĐ `->` QKĐ

`7.` he/she would move

`-` will `->` would

`__________________________`

`@` Câu gián tiếp dạng câu kể:
`+` S + said + (that) + S + V(lùi thì)

`+` S + said to/ told + O + (that) + S + V(lùi thì)

`***` Câu tường thuật gián tiếp: S + said to sb/told sb + (that) + S + V (lùi thì)

`-` Tùy từng câu mà đổi ngôi và trạng từ chỉ thời gian/nơi chốn cho phù hợp.

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

`1.` visited his

`-` Lùi thì: HTĐ `->` QKĐ

`-` Đổi ngôi: my `->` his ('he')

`2.` they had seen

`-` Lùi thì: QKĐ `->` QKHT

`-` Đổi ngôi: we `->` they ('the children')

`3.` they hadn't caught

`-` Lùi thì: HTHT `->` QKHT

`-` Đổi ngôi: we `->` they ('the police')

`4.` he could help them

`-` Lùi thì: can `->` could

`-` Đổi ngôi: I `->` he ('Matthew'), you `->` them ('the men')

`5.` had

`-` Lùi thì: HTĐ `->` QKĐ

`6.` knew

`-` Lùi thì: HTĐ `->` QKĐ

`7.` he would move

`-` Lùi thì: will `->` would

`-` Đổi ngôi: I `->` he ('the detective')