1.
B: was talking
2.
Dan: were you talking
Steve: was telling
3.
A: Were you watching
B: was reading
4.
A: Were you playing tennis
B: wasn't playing, was doing
Объяснение:
past continuous строится по такой структуре:
+: подлежащее+was(I, he, she, it)/were(you,we,they)+Ving (глагол с окончанием ing)
-: подлежащее+was not/were not (wasn't/weren't)+Ving
?: Was/Were+подлежащее+Ving
