IV

1,have learnt

2,has played

3,hasn't rained

4,haven't seen

5,have studied

6,has worked

7,has seen

8,has been

9,have had

10,has played

V

1,is looking

2,has learned

3,have you known / have known

4,Has she fed

5,haven't seen / were 

6,Has she finished

7,Has your dog ever bitten / bit

8,have just made 

9,Have you ever been 

10,started

VI

1,What did Nam repair yesterday? 

2,When did you receive my letter? 

3,What time does she go to school? 

4,Where did you meet your old teacher yesterday? 

5,How long has your sister studied French? 

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5. How long has your sister studied French?