Many.................

47. Many music lovers enjoyed the show "My soul," which was performed by My Tam.

N (vật) + which + V / S+ V 

48. If Mr. Ba weren't old, he could continue the work.

If 2: If + S + were + O , S + would / could + V1 (were áp dụng cho mọi chủ ngữ)

49. My sister has worked as an English teacher for ten years.

S + started / began + to V / Ving 

= S+ has/have +V3/ed + for/since + time 

50. No one in Mary's class is as excellent as her.

S + be + as + adj + as + O ; ss bằng