22. doesn't go

 Singular S → auxiliary is "does", negative form → "doesn't"

23. isn't

 Singular S → tobe is "is", negative form → "isn't"

24. gets - has - brushes - goes - has

 Singular S → V(s/es)

25. watch

 Plural S → V-inf

26. don't do 

 S is "I"→ auxiliary is "do", negative form → "don't"

27. Do Mai and Lan play

 Plural S → auxiliary is "do", question form → Auxiliary before S → Do Mai & Lan...

28. listens

 Singular S → V(s)

29. What do you do? - am

 Q: S is "you" → auxiliary is "do", question form → Auxiliary before S → What do... 

 A: S is "I" → tobe is "am"

30. meet

 S is "I" → V-inf

31. rises - sets

 Singular S → V(s)

32. What does your son have...? - Does he usually eat... drink

 S is "your son", "he" → Singular S → auxiliary is "does", question form → Auxiliary before S

33. Does he eat

 Singular S → auxiliary is "does", question form → Auxiliary before S

34. doesn't go

 Singular S → auxiliary is "does", negative form → "doesn't"

35. has - are

 Singular S1 → "have" changed to "has"

 Countable, Plural S2 → tobe is 'are"

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