Đáp án + Giải thích bước giải:

`4.` The teacher said all the homework had to be done carefully 

`-` Câu tường thuật: S + said/told + (that) + S + V(lùi thì)

`-` Must be `->` had to

`5.` Her father told her could go to the movie with her friend         

`-` Câu tường thuật: S + said/told + (that) + S + V(lùi thì)

`-` Can `->` could

`6.` Hoa said she might visit her parents in the summer

`-` Câu tường thuật: S + said/told + (that) + S + V(lùi thì)

`-` May `->` might

`7.` The teacher said they could collect old book for the poor students 

`-` Câu tường thuật: S + said/told + (that) + S + V(lùi thì)

`-` Can `->` could

$\color{black}{1}$ 

→ The teacher said all the homework had to be done carefully .

$\color{black}{2}$ 

→ Her father told her could go to the movie with her friend .

$\color{black}{3}$ 

→ Hoa said she might visit her parents in the summer .

$\color{black}{4}$ 

→ The teacher said they could collect old book for the poor students .

$\color{black}{-}$  $\color{black}{-}$  $\color{black}{-}$  $\color{black}{-}$  $\color{black}{-}$  $\color{black}{-}$  $\color{black}{-}$  $\color{black}{-}$  $\color{black}{-}$  $\color{black}{-}$ 

→ S + Said/Told + ( that ) + S + V +....

          Say/Tell

→ S + Told + O + To infinitive + .....

→ S + asked / Wanted to know / wondered + (O) +  WH + S + V +....