2 was cleaning, was working
3 found, was playing
4 was having, came
5 was knitting, was smoking
6 arrived, was painting
7 were walking, started
8 were you talking, came
9 was reading, knocked
10 was washing, cut
11 broke, was dusting
12 was building, was swimming
*Для действий в процессе (незаконченных/длительных действий) используем Past Continuous.
Для однократных ("быстрых") действий в нужно брать Past Simple.
2 was cleaning, was working
3 found, was playing
4 was having, came
5 was knitting, was smoking
6 arrived, was painting
7 were walking, started
8 were you talking, came
9 was reading, knocked
10 was washing, cut
11 broke, was dusting
12 was building, was swimming
*Для действий в процессе (незаконченных/длительных действий) используем Past Continuous.
Для однократных ("быстрых") действий в нужно брать Past Simple.