51. I haven't gone swimming when we were in Spain.
52. It's weeks since you tidied this room.
53. We have looked for a flat fot 2 months and we are still looking.
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 someone has challenged his authority.
57. It's 2 years since she left university.
58. I have never known a more warm-hearted person than my mother.
59. It is over a year since I last saw them.
60. It has started to rain for 2 hours.
* Cấu trúc: S + haven't/hasn't + Vpp + for/since + time.
= S + last + Ved ... time + ago
= The last time S +Ved + was + time + ago
= It is + time + since + S + last + Ved
Chúc em học tốt. Xin 5 sao và CTLHN.
