Ответ:

ex 1.1

1. he's
2. they're
3. she isn't
4. it's
5. I'm not
6. you aren't или you're not
7. we are not
8. I am
9. you are
10. they are not
11. it is not
12. she is

ex 1.2

1. is
2. am
3. is
4. are
5. is
6. is
7. am
8. is
9. are
10. is
11. am,is

ex 1.3

1. My shoes are very dirty
2. My bed is very comfortable
3. Your cigarettes are in your bag
4. I'm not very happy today
5. This restaurant is very expensive
6. The shops are not open today
7. Mr. Kelly's daughter is six years old
8. The houses in this street are very old
9. The examination is not difficult
10. Those flowers are very beautiful

ex 1.4.-тут надо написать отрицатительные или утвердительные предложения. Я незнаю когда какое использовать.И поэтому просто попробую.

3.I am hungry

4.It isn't warm today

5.Rome is in Spain

6.I am not afaid of dogs

7.My hands aren't cold

8.Canada is a very big country

9.The Amazon isn't in Africa

10.Diamonds are cheap

11.Motor-racing is a dangerous sport

12.Cats aren't big cats