Exercise 1
a. How long have you known Mrs Chi? I have known her for five years.
b. We haven't seen her since we were on our holiday Ha Long Bay.
c. Lan has finished her homework already.
d. My sister hasn't visited us since she moved to Hanoi.
e. Minh likes listening to music in his freetime.
f. Look at that clound. It's going to rain.
g. Our town is becoming more beautiful now.
h. I hate cooking but I enjoy planting trees.
Exercise 2
a. since
b. since
c. since
d. for
e. since
f. for
Exercise 3
a. They used to eat noodles.
b. My brother enjoys playing soccer.
c. I'm not strong enough to carry the box.
d. I started learning English for four years ago.
e. Miss Hoa said that Binh should read English stories.
