`color{#C0FF3E}{N}color{#9ACD32}{h}color{#9ACD32}{o}`

`1.` were having `-` rang

`2.` was smoking `-` was reading

`3.` was mowing `-` started

`4.` was having `-` blew

`5.` came `-` was waiting

`6.` saw `-` was driving

`7.` was waiting `-` was doing

`8.` arrived `-` were having

`9.` were playing `-` went

`10.` were having `-` was sleeping

`11.` took `-` was feeding

`12.` were playing `-` went

`13.` were cleaning `-` was doing

`14.` was doing `-` phoned

`15.` were waiting `-` arrived

_________________________________________________

`@` Cthuc thì QKTD:

`(+)` S `+` was/were `+` V-ing `+` O.

`(-)` S `+` was/were `+` not `+` V-ing `+` O.

`(?)` Was/ were `+` S `+`  V-ing `+` O `?`

Wh- `+` was/ were `+` S `+`  V-ing `+` O `?`

`@` Cthuc thì QKĐ:

`(+)` S `+ V^2 +` O

`(-)` S `+` didn't `+` V(bare) `+` O.

`(?)` Did `+` S `+` V(bare) `+` O `?`

Wh- `+` did `+` S `+` V(bare) `+` O `?`