1. was playing - entered
`->` S + V(past continuous) when + S + V(simple past).
2. was studying - came
`->` S + V(past continuous) when + S + V(simple past).
3. was washing - rang
`->` S + V(past continuous) when + S + V(simple past).
4. was eating - were drinking
`->` S + V(past continuous) while S + V(past continuous).
5. was watching - jumped
`->` S + V(past continuous) when + S + V(simple past).
Giải thích thêm:
- Past continuous (quá khứ tiếp diễn): S + was/were + V_ing.
- Simple past (quá khứ đơn): S + V(ed/ cột 2).
