I ( talk) _______________ about him when suddenly he ( come) ______________ in last night. 48. He ( not be) _________________ present at class yesterday. 49. What ( happen) _________________ to you yesterday? 50. Yesterday afternoon, the boys ( break) ______ the windows when they ( play) __________ football.

I ( talk) talk about him when suddenly he ( come) comes in last night.

48. He ( not be) didn't go present at class yesterday.

49. What ( happen) happened to you yesterday?

50. Yesterday afternoon, the boys ( break) break the windows when they ( play) played  football.

=> talk = giữ nguyên mẫu 

=> comes = chia ở thì hiện tại đơn

=> didn't go = dâu hiệu yesterday

47. was talking, came

Hành động đang xảy ra trong quá khứ → QKTD

Hành động chen vào → QKĐ

48. wasn't 

yesterday → QKĐ

49. happend

yesterday → QKĐ

50. broke, were playing

Hành động đang xảy ra trong quá khứ → QKTD

Hành động chen vào → QKĐ

*Cấu trúc thì quá khứ tiếp diễn:

(+) S + was/ were + V_ing

(- ) S + was/ were + not + V_ing

(? ) Was/ Were + S + V_ing?

*Cấu trúc thì quá khứ đơn:

(+) S + V_ed/ V2

(- ) S + didn't+ V_inf

(? ) Did + S + V_inf?