Lời giải:

EX4

1. hadn't  played

2,are attending 

3,haven't had

4,haven't seen

5,is having 

6,is happened

7,have just realized

8,is going to finish or finished

9,is composing or  has composed

10, a, are having 

       b, are  having just 

EX5

1,She has lived in Ha Noi for 2 years

2,He has studied English since he was young 

3,This is the first time I have ever eaten this kind of food

4,She is the most beautiful girl I have ever seen

5,I have never read such a good novel before 

EX6

1,We haven't eaten out since mom's birthday 

2,How long have you lived here? 

3,Have you ever been to Russia? 

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IV

1,hasn't played

2,are attending 

3,haven't had

4,haven't seen

5,is having 

6,is happened

7,have just realized

8,is going to finish / finished

9,is composing / has composed

10,are having / are just having 

V

1,She has lived in Ha Noi for 2 years

2,He has studied English since he was young 

3,This is the first time I have ever eaten this kind of food

4,She is the most beautiful girl I have ever seen

5,I have never read such a good novel before 

VI

1,We haven't eaten out since mom's birthday 

2,How long have you lived here? 

3,Have you ever been to Russia?