II change the following sentences into passive form

She couldn't open the door because she left the key in the car

-> the door

No one can answer this question

-> this question

Our teacher used to left us talk in class

->

Giải thích 2 câu cuối giúp em với

`1`.The door couldn't be opened because she lefy the key in the car

`\rightarrow` Câu bị động `-` Could : S + could be + V3 / PII ( by O )

`2`.This question can't be answered

`\rightarrow` Câu bị động `-` Can : S + can be + V3 / PII ( by O )

`3`.We used to be left talk in class by our teacher

`\rightarrow` Câu bị động `-` Used to : S + used to be + V3 / PII ( by O )

`\text{@ TheFox}`