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Ex2: 

1 - is

2 - are

3 - are

4 - is

5 - is

6 - are

7 - am

8 - are

Ex3: 

1 - is

2 - is

3 - are - are not

Ex 4:

1 - study

2 - study

3 - study

4 - study

5 - studies

6 - studies

7 - studies