`-` BĐ :

`+` QKĐ : S + was / were + VpII ( by O )

`+` HTTD : S + is / am / are + being + VpII ( by O )

`+` HTHT : S + have / has + been + VpII ( by O )

`6`.Why wasn't he helped ?

`7`.Are big cakes being made for the party ?

`8`.The cake is being cut with a sharp knife by Mary

`9`.The murderer hasn't been found by the police yet

`\text{# TF}`

`6.` Why wasn't he helped?

`-` Bị động thì QKĐ (?) (Wh-question) + was/were + S + V3/Ved + (by O)?

`7.` Are big cakes being made for the party?

`-` Bị động thì HTTD (?) Am/Is/Are + S + being + V3/Ved + (by O)?

`8.` The cake is being cut with a sharp knife by Mary.

`-` Bị động thì HTTD (+) S + am/is/are + being + V3/Ved + (by O)

`9.` The murderer hasn't been found by the police yet

`-` Bị động thì HTHT (-) S + have/has not + V3/Ved + (by O)