41. went - has finished
42.  has undertoodund
43. have gone - sat - rested
44. has started
45. listened - has done
46. closing
47. to see
48. to go
49. to use
50. having

41. Before she (go)went to bed, she (finish) had finished her homework.                         

42. Few people (understand) understood the news when the consequences began to appear.

43. After they (go) had gone, he (sit) sat down and (rest) rested.

44. When I came to the theatre, the film (start)had started.

45. Before she (listen)listened to music, she (do) had done homework

46. Would you mind (close)                                   closing the window?

47. I'd really love (see) to seeyou again.

48. It was a nice day, so we decided (go) to gofor a walk.

49. I've got a new smart phone. I haven't learnt (use) to use it yet.

50. I hate (have) having to get up early on Sunday!

1. Before she went to bed, she had finished her homework.
2. Few people understood the news when the consequences began to appear.
3. After they had gone, he sat down and rested.
4. When I came to the theatre, the film had started.
5. Before she listened to music, she had done her homework.
6. Would you mind closing the window?
7. I'd really love to see you again.
8. It was a nice day, so we decided to go for a walk.
9. I've got a new smart phone. I haven't learnt to use it yet.
10. I hate having to get up early on Sunday.