37. They haven't replied my invitation. Therefore, I think that they're not coming to my party.

⇒ Since they haven't replied my invitation, I think that they're not coming to my party.

(since = because = as : bởi vì

 therefore: do đó, do vậy

Dịch : Bởi vì họ chưa trả lời lời mời của tôi nên tôi nghĩ rằng họ sẽ không đến bữa tiệc của tôi.)

38. His English is too bad to be an interpreter.

⇒ He doesn't study English well enough to be an interpreter.

( Công thức :  too + adj/adv + to_V

                  ⇔ not + adj + enough + to_V

be good at : giỏi về cái gì )

39. I was disappointed by the bad quality of the wine.

⇒ I was disappointed that the quality of wine was bad.

( Dịch : Tôi đã thất vọng vì chất lượng của rượu tệ.)

40. We should set off early, or we'll get stuck in traffic.

⇒ If we don't set off early, we'll get stuck in traffic.

( Công thức : S+ should+ $V_{(HT)}$ , or S+ will+ $V_{(HT)}$

                  ⇔ If+ S+ do/does+ not+$V_{(HT)}$, S+ will+ V)