47. I spent 2 hours finishing this report
( spend + time + V-ing = it takes sb time to do sth : tốn thời gian để làm gì đó)

48. I have just been given a new computer by my uncle

( đây là bị động thì hiện tại hoàn thành : $S_2+have/has+been+V_3/ed by S_1$)

49. Mary wishes she had enough free time to read these novels
( wish thì hiện tại: S + wish(es)+S+V2/ed )

50. No sooner had she finished one project than she started the next.
( No sooner had S + V3/ed + than + S + V2/ed)

47. I spent 2 hours finishing this report.

48. I have just been given a new computer by my uncle.

49. Mary wishes she had enough free time to read these novels.

50. No sooner had she finished one project than she started the next.