2. is playing 

-> HTTD : S+ is/am/are+ V_ing

3.  finishes

4. brush

5. are having

6. is studying

7. play

8. is snowing

9. have

10. live

11. walks 

12. am going

13. drives

14. eat out

15. is riding

16. is washing 

17. are learning

18. am writting

19. takes

20. is washing 

⇔ CT: Am + S + V

⇒ Ing + S + V

⇒ Is + S + V...(sb)

$\text{2.}$ is playing 

$\text{3.}$ finishes

$\text{4.}$ brush. 

$\text{5.}$ are having

$\text{6.}$ is studying

$\text{7.}$ play

$\text{8.}$ is snowing

$\text{9.}$ have

$\text{10.}$ live

$\text{11.}$ walks 

$\text{12}$ am going

$\text{13.}$ drives

$\text{14.}$ eat out

$\text{15.}$ is riding

$\text{16.}$ is washing 

$\text{17.}$ are learning

$\text{18.}$ am writting

$\text{19.}$ takes

$\text{20.}$ is washing