50 When did you learn to drive?
-> How long is it .......................
51 The last tiem I went swimming was when we were in Spain
-> I haven't.............................
52 You haven't tidied this room for weeks
-> It's weeks.......................
53 We started looking for a flat 2 months ago and we are still looking
-> We have.......................
54 This is the first time I've been to a night club
-> I haven't............................
55 They have never heard such a thing before
-> This is the first time..................
56 No one has cha;;enged his authority before
-> This is the first tiem....................
57 She left university 2 years ago
-> It is...................................