把下列各句子变为被动语态

1.The boy is being operated on by the doctor.
2.A lot of students were seen playing games on the playground by us.(by us可加可不加)
3.You were not made by the boss to carry these heavy boxes. (by the boss 也可以放在句子末尾)

1.The boy is operated by the doctor.

2.A lot of students were saw by us playing games on the playground.

3.The boss didn't make these heavy boxes carried by you.

the boy is operated on by The doctor
.a lot of students were seen paying games on the playground by us
you were not made to carry these heavy boxes by The boss

The boy is been operating by the doctor
A lot of students were seen playing games on the playground
You weren't made to carry these heavy boxes by the boss