KhanhHuyen2006
36. waiting
not mind doing sth: không ngại làm việc gì
37. is - is visited (every year -> hiện đại đơn)
38. goes - will see
Câu điều kiện
39. witnessed (yesterday -> quá khứ) - was knocked - was taken
40. visited - was doing
41. are using (dấu hiệu at present) - was invented
42. haven't seen (dấu hiệu recently) - haven't gone - bought
43. is made - cooks - ask
Tham khảo thêm
Các thì cơ bản
Chúc bạn học tốt!