9. was watching/ was reading/ was doing/ was playing

10. was doing

11. was watering

12. were sitting

13. were learning

14. were doing

15. were playing

$\text{- Cấu trúc quá khứ tiếp diễn:}$

(+)  I/He/ she/it/ Danh từ số ít+ was+ Ving

      We/ you/ they/ Danh từ số nhiều+were+ Ving

(-)   I/He/ she/it/ Danh từ số ít+ wasn't+ Ving

      We/ you/ they/ Danh từ số nhiều+weren't+ Ving

(?)  Was+ I/he/ she/it/ Danh từ số ít+ Ving?

      Were+ we/ you/ they/ Danh từ số nhiều+ Ving?

$\textit{# Themoonstarhk}$

`9.` was watching `/` was reading `/` was doing `/` was playing

`10.` was doing

`11.` was watering

`12.` was visiting

`13.` were learning

`14.` were doing

`15.` were playing

`=>` Thì Quá khứ tiếp diễn

`=>` Cấu trúc `:`

`(+)` `S` `+` was `/` were `+` `V_{Ing}` `+` `...`

`(-)`  `S` `+` was `/` were `+` not `+` `V_{Ing}` `+` `...`

`(?)`  Was `/` Were `+` `S` `+` `V_{Ing}` `+` `...` `?`

`=>` Dùng để  diễn tả một hành động, sự việc đang diễn ra xung quanh một thời điểm trong quá khứ.