Exercise 1:
1. rises, sets
Điều hiển nhiên nên dùng thì HTĐ
2. is
often → HTĐ
3. listening
enjoy + V_ing
4. boils
Điều hiển nhiên nên dùng thì HTĐ
5. to go
S + V + noun + enough + for sb + to V
6. studying
prefer + V_ing
7. doing
S + spend + time + V_ing
8. received
last week → QKĐ
9. left
two years ago → QKĐ
10. watched
last summer → QKĐ
Exercise 2:
1. She is not old enough to go to school alone
2. She isn't old enough to ride a motorbike
3. I am lucky enough to have many good friends
4. Those apple aren't ripe enough for we to eat them
*Cấu trúc enough: S + be + adj + enough + for sb + to V
