Câu bị động ( Thì HTĐ `-` QKĐ `-` HTHT `-` TLG ) :

`-` Thì HTĐ : S + be + V3 / PII ( by O )

`-` Thì QKĐ : S + was / were + V3 / PII ( by O )

`-` Thì HTHT : S + have / has + been + V3 / PII ( by O )

`-` Thì TLG : S + is / am / are + going to be + V3 / PII ( by O )

`1`.A.have be `\rightarrow` have been

`2`.C.start `\rightarrow` started

`3`.A.were found `\rightarrow` was found

`4`.C.been `\rightarrow` be

`5`.B.be `\rightarrow` Bỏ

`\text{@ TheFox}`

`1.` b

`=>` Dạng bị động

`=>` have be sữa thành have been

`2.` b 

`=>` start thêm ed

`3.` a

`=>` were found sữa thành was found

`4.` c

`=>` been sữa thành be

`5.` b

`=>` be bo

(phần câu 5 này mk chưa chắt lắm xin lỗi ạ)