a) 1 he hasn't arrived yet;
2 We haven't seen each other;
3 Have you ever written;
4 She's never been to;
5 I lent him €50;
6 I've known them for ten years;
7 What year did you leave;
8 We have already been;
9 she hasn't replied yet;
10 They've lived in that house
b) 1 have you been, started, lived, moved, 've lived
2 Has your brother found, 's just started
3 Have you ever been, went, was, cost