Câu tường thuật - dạng câu kể 

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

S + said + (that) + S + V (lùi thì)

Câu tường thuật - dạng Yes/No-questions 

S + asked / wanted to know / wondered + (O) +if/whether + S+ V (lùi thì)

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38. Janet told John that she hadn't promised to send him a telegram.

QKD --> QKHT 

39. She said that she would get herself a drink.

will --> would 

40. He said that he couldn't drive them home.

can --> could 

41. She asked Peter if he preferred tea or coffee.

HTD --> QKD

42. He said that the film had begun at seven o'clock.

QKD --> QKHT

43. The father said that he had been on a business trip the whole day the day before.

QKD --> QKHT

yesterday --> the day before / the previous day 

`color{orange}{~MiaMB~}`

`38.` Janet said to John that she had not promised to send him a telegram.

`-` Câu tường thuật : S + said to + O + (that) + S + V(lùi thì)

`-` Biến đổi thì : QKD `->` QKHT

`39.` She said that she would get herself a drink.

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

`-` Biến đổi thì : will `->` would ( dạng QK )

`40.` He said that he could not drive them home.

`-` Biến đổi thì : can `->` could ( dạng QK )

`41.` She asked Peter if he prefered tea or coffee.

`-` Câu tường thuật : S + asked + O + if + S + V(lùi thì)

`-` Biến đổi thì : HTD `->` QKD

`42.` He said that the film had begun at seven o'clock.

`-` Biến đổi thì : QKD `->` QKHT

`43.` The father said that he had been on a trip the whole day the day before.

`-` Biến đổi thì : QKD `->` QKHT