38. The river is too dirty we can not swim in.
36. You have to do your homework every day.
37. Nam isn't old enough to drive a car.
39. I used to have a dog last year but I don’t have any more now.
40. It's too dangerous to put a knife into an electrical socket
41. John used to smoke a lot a year ago, but now he doesn’t smoke any more
42. It’s time you went to school
Cấu trúc với Enough to: đủ….để có thể làm gì
Khẳng định
S + V + adv + enough + (for somebody) + to + V
S + to be + adj + enough + (for somebody) + to + V
Phủ định
S + tobe not + adj + enough + (for sb) + to infinitive
S + don’t/doesn’t/didn’t +V + adv + enough + (for sb) + to infinitive
Used to + V1 : đã từng
It's + too + adj + to V : Nó quá làm sao để làm gì
It's time + S + V2/ed : đã đến lúc … phải làm gì
It is (not) necessary = You (not) have to