41.This is the first time I've been to a night club.
=> I haven't been to a night club before.
42.No one has challenged his authority before.
=> This is the first time his autority has been challenged.
43.She left university 2 years ago.
=> It is 2 years since she left university.
44.I haven't been able to see them for over a year.
=> It is over a year since I was able to see them.
45.I have never been to the ballet before.
=> It is the first time I have ever been to the ballet.
46.John and Mary moved to Edinburgh twenty years ago.
=> It is twenty years since John and Mary moved to Edinburgh.
47.It is ages since Alan visited his parents.
=> Alan hasn't visited his parents for ages.
48John has not had his hair cut for over six months.
=> It is over six months since John had his hair cut.
41 I haven't been to a night club before
42 This is the first time someone has challenged his authority
43 It is 2 years since she left university
44 It is over a year since I was last able to see them
45 It is the first time I have been to the ballet
46 It is twenty years since John and Mary moved to Edinburgh
47 Alan hasn't visited his parents for ages
48 It is over six months since John last had his hair cut
