2.If you keep talking,you won't  understand the lesson.

3.If I know her number,I will call her up.

4.If I know the answer,I will tell you.

5.If we have a map,we won't get lost.

why do we have to study English?

Playing video game isn't as good as playing sport

1.a

2.b

3.d

4.b

5.c

6.a

7.c

8.b

9.c

10.b

11.b

12.a

13.c

14.a

15.d

16.c

17.d

18.a

1.did-do-did

2.used to

3.Got-had

4.did-buy

1.She isn't going to do homework tomorrow.

2.Alex was eating dinner at half past 6 yesterday

3.My brother has to wash the dishes at home

FIREWORK

1.My family has a tradition of having dinner ar home before 7 p.m.

2.-Although the test was very difficult,we could do it.

   -Despite how hard the test was,we could do it.

3.The test must be done during 45 minutes.

4.-Nam spent 2 hours on the trip to the countryside.

   -It took Nam 2 hours on the trip to the countryside.

   -Nam had a trip that lasted 2 hours.

5.They repaint the house with white and yellow.

you mustn'tuse my computer while I am away this weekend.

Sarah gave me a promise that she will come to my birthday party 4:50,but she doesn't show up at 5:30.