1. does / go
2. Does / do
3. don't play
4. do classes start/ start
5. don't have
6. takes
7. are reading
8. Do you brush
9. is talking
10. are they going

1. does your father go
2. Does he do
3. do not play
4. do classes start
    start
5. do not have
6. takes
7. are reading
8. Do you brush
9. is talking
10. are they going

11. doesn't get
12. brushes
13. Does Nam get
14. Do Ba and Nam go
15. Does Tuan wash
16. has
17. don't wash
18. brush
19. is
20. are

21. am waiting 
22. travels
23. is walking
24. are watching
25. Is she listening
26. Do they travel
27. is she going
28. are you doing
29. doesn't play
30. don't go

11) does not get
12) brushes
13) does Nam get
14) do Ba and Nam go
15) does Tuan wash
16) has
17) do not wash
18) brush
19) is
20) are

31. am watching
32. listens
33. don't play
34. aren't doing
35. Are you reading
36. Does your brother wash
37. are the children doing
38. is Mr Minh working?
39. does your father travel
40. wil you do

21) am waiting 
22) travels
23) is walking
24) are watching
25) is she listening
26) Do they travel
27) is she going
28) are you doing
29) does not play
30) do not go
31) am watching
32) listens
33) do not play
34) are not doing
35) Are you reading
36) Does your brother wash
37) are the children doing
38) is Mr Minh working?
39) does your father travel
40) wil you do

40. isn't driving
41. will you do
42. jogs 
43. is watching
44. doesn't go
45. is skipping 
46. isn't
47. speak
48. will visit
49. are playing
50. will go
51. is/ goes/ gets/ leaves/ lives/walks/ starts/ ends/ arrives/ has/ is / is doing/ is writing/ are wating
* Câu 40 bên trên mình nhầm đấy, mình sửa lại ở đây

:)) Mạnh cop sai rồi kìa, câu 40 mình làm nhầm thành câu 41. tự dưng làm dài thế là có biến rồi :))

45. is skipping 
46. is not
47. speak
48. will visit
49. are playing
50. will go

21, am waiting
22, travels
23, is walking
24, is watching
25, Is she listening
26, Do they travel
27, Where is she going
28, Are you doing
29, does not play
30, do not go

Thế bài này thì sao HUyenf thu 
https://lazi.vn/edu/exercise/oxi-hoa-hoan-toan-4-8g-kim-loai-x-co-hoa-tri-ii-sau-phan-ung-thu-duoc-8g-mot-oxit
Nếu Ngoc Hai sai thì bạn cũng sai theo đúng k