4 Running a mile a day is good exercise.

5 It is interesting to go swimming in the river in the summer.

Cấu trúc: Ving is + adj = It is adj to Vo

6 Being is a great pleasure with you.

cấu trúc "being + giới từ" để nói về những hành động hoặc những cách hành xử, cư xử của người khác.

10 It is good for your health to play football.
11 Participating in school activities is interesting.
12 It is necessary to recycle paper and cans.
13 Climbing high mountains alone in the winter isn’t safe.
14 It is a good activity to help poor children.
15 It’s very important to keep the environment clean.
16 It is very interesting to have a vacation abroad.
17 It is a waste of time to ask him for help.
18 It is quite easy to learn to drive.
19 It was interesting to see that film.
20 Taking part in the young pioneers club is interesting.
21 It is boring to talk to him.
22 To jog in the morning is good exercise.
23 It is a good activity at home to help mum with housework.
24 It’s very difficult to find accommodation at this time in HLBay.
25 It is interesting to go fishing with his friends at weekends.