` 37 ` : were - playing

`- ` QKTD nghi vấn : Was / were + S + V-ing ?

` DHNB ` : at 2 o 'clock yesterday afternoon

` 38 ` : have - learnt

`- ` How long + have / has + S + VPII ?

` 39 ` : did - do

` -` QKĐ nghi vấn : Did + S + V nguyên mẫu

` DHNB `: Last sunday

` 40 ` : has he lived

`- ` How long + have / has + S + VPII ?

` 41 ` : did - meet

` -` QKĐ nghi vấn : Did + S + V nguyên mẫu

` DHNB `:yesterday 

` 42 ` : were studying - came

` -` Diễn tả 1 hành động đang xray ra thì 1 hành độn khác xen vào thì chia thì QKTD 

` - ` S + was / were + V-ing

` 43 ` : has written - moved

`- ` Trước since chia thì HTHT . sau since chia thì QKĐ 

` - ` S + have / has + VPII + since + 1 mốc TG / QKĐ

` 44 ` : was meeting - was going 

` - ` QKTD : S + was / were + V-ing

37. did you play

=> Có yesterday chia thì QKD

=> Did+S+V(inf)+O?

38. have Bod and Mary learnt

=> Có how long chia thì HTHT

39. did he do

=> Có last chia thì QKD

=> Did+S+V(inf)+O?

40. Has he lived

=> Có how long chia thì HTHT

41. did you meet

=> Có yesterday chia thì QKD

=> Did+S+V(inf)+O?

42. was studying- came

=> Hành động đang xảy ra trong quá khứ(QKTD) có hành động khác xen vào (QKD)

43. has writen- moved

=> HTHT since+QKD

44. met- was going 

=> Hành động đang xảy ra trong quá khứ (QKTD) có hành động khác xen vào (QKD)