1. 1) differs
2. 1) had arrived
3. 3) was sitting
4. 1) was starting
5. 2) has found
6. 1) was talking
7. 1) have been planning
8. 1) met, 2) had given
9. 2) has invited
10. 1) shall be
11. 2) went, 2) walked
12. 1) were going
13. 3) is celebrated
14. 3) wear
15. 2) was making