Exercise 2:

1. My dad is watering some plants in the garden.

2. My mom is cleaning the floor.

3. Mary is having lunch with her friends at a restaurant.

4. They are asking a man about the way at the rainway station.

5. My student is drawing a beautiful picture.

Exercise 3:

1. have bought 

2. haven't planned

3. have gone

4. haven't finished

5. Have you learned 

Exercise 4:

1. are / reach

2. comes  

3. came / had left 

4. has never flown

5. have just decided / would undertake 

6. would take 

7. was  

8. am attending / was attending 

9. arrive / will be waiting 

10. had lived 

11. got / had already arrived

12. will see / see / will have graduated.

13. visited / was