18.3
2 She has lived in Wales all her life.
3 They have been on holiday since Sunday.
4 The sun has been shining all day.
5 She has been waiting for ten minutes.
6 He has had a beard since he was 20.

18.4
2 know
3 have known
4 have you been
5 works
6 has been
7 have you lived
8 I've had
9 is, has been

9.1
3 for
4 since
5 since
6 for
7 for
8 for, since

9.2
2 A long time ago.
3 About a month ago.
4 About 2 weeks ago.
5 About a year ago.