48.I haven't really enjoyed myself since your birthday party.

49.My father hasn't seen his brother for nearly 20 years.

50.How long has it been since you learnt to drive?

51.I haven't gone swimming since we were in Spain.

52.It's weeks since you tidied your room.

53.We have looked for a flat for 2 months.

54.I haven't been to a night club before.

55.This is the first time they have heard such a thing.

56.This is the first time his authority has been challenged 

57.It is 2 years since she left university.

58.I have never known such a more warm-hearted person than my mother.

59.It is over a year since I was able to see them.

48.I haven't really enjoyed myself since your birthday party.

49.My father hasn't seen his brother for nearly 20 years.

50.How long is it since you learnt to drive?

51.I haven't gone swimming since when we were in Spain.

52.It's weeks since you last tidied your room.

53.We have looked for a flat for 2 months and we are still looking.

54.I haven't been to a night club before.

55.This is the first time they've ever heard such a thing.

56.This is the first time his authority has been challenged.

57.It is two years since she left university.

58.I have never known a more warm-heated person than my mother.

59.It is over a year since I last was able to see them.