Sau when dùng past simple, while dùng past continuous

Yesterday, last week, last night --> Past Simple

At this time ...--> Past Continuous

31.fell/was painting

32.were you doing

33.went/was raining

34.were watching/phoned

35.were playing

36.weren't working

37.fell

38.came/weren't staying

39.were you doing 

40.were you/came

31, fell - was painting (QKD + while + QKTD)

32, were you doing (QKTD - dấu hiệu: at this time yesterday)

33, went - was raining (QKD + when + QKTD)
34, Were you watching - phoned (QKTD + when + QKD)

35, were playing (QKTD + when + QKD)

36, weren't working (QKTD - dấu hiệu: at this time last week)

37, fell (While + QKTD + QKD)

38, came - weren't staying (When + QKD + QKTD)

39, were you doing (QKTD - dấu hiệu: at this time yesterday)

40, were you - came