39. The doctor told him that he worked too hard. (work) …………………………………………………………………………………………………… 40. We started cooking for the party four hours ago. (have) ……………………………………………………………………………………………………

`Đáp` `án:`

39. "You worked too hard", the doctor said to him.

S + told + O + (that) + S +V (lùi thì)

HTĐ → QKĐ

40. We have been cooking for the party for four hours.

S + started / began + to V/  Ving

= S + has/have + been + Ving + for/since +time