Ex.1could=1; couldn't=2; managed to=3
1-3;2-1;3-2;4-2;5-1.
Ex.2
1was doing,saw,stoped,had.
2was,didn't know
3had, was looking
4lied, opened,started
5saw,was walking, was waiting
Ex.3
habe been,was,made,was,made,took,had been,visited,were,bought,have been living