`\color{#145277}{N}\color{#246483}{a}\color{#34768F} {e}\color{#44889B}{u}\color{#539AA7}{n}`

`6.` This letter was sent to me by Mary `2` days ago.

`-` Bị động QKĐ : S + was / were + V3/ed

`-` DHNB : `2` days ago

`7.` Compost is made from vegetables.

`-` Bị động HTĐ : S + am / is / are + V3/ed

`8.` This work must be finished before Sunday.

`-` Bị động Modal verb : S + must / can / `...` + be + V3/ed

`9.` This bicycle hasn't been used for a long time.

`-` Bị động HTHT : S + have / has + been + V3/ed

`-` DHNB : for a long time

`10.` A strange man was seen in my garden yesterday.

`-` Bị động QKĐ : S + was / were + V3/ed

`-` DHNB : yesterday

`6.` I was sent this letter by Mary two days ago

`7.` Compost is made from vegetables 

`8.` This work must be finished before Sunday

`9.` This bicycle hasn't been used by her for a long time

`10.` A strange man was seen in my garden yesterday

`____________________________`

`***` Bị động:

`*` HTĐ: S + am/is/are + V3/ed + (by + O)

`*` QKĐ: S + was/were + V3/ed + (by + O)

`*` HTHT: S + has/have + been  + V3/ed + (by + O)

`*` ĐTKT : S + must/can/... + be + V3/ed + (by + O)