4.
1)
a) Have you seen it?
b) I saw it in London...
2) we went to Brighton but I haven't been there...
3)
a) ... you have met her before.
b) We were at school together.
4)
a) I have tried to phone...
b) He left work...
5.
1) I have travelled
2) Mr White has never called me...
3) When did he call?
4) I often played football when I was a boy. I have played very often since then.
5) Who has heard...
6) This is the first time he has flown.
