The floor is being swept by us.(现在进行时的被动语态结构，be+being+ed)
He is called Robert by me.(一般现在时的被动语态结构，be+ed)
They have done homework.(被动语态中介词by的宾语变主动语态时为主语）
She will clean the room.（一般将来时的被动语态结构，will be +ed,原句就是被动的，变主动就完了）
注意，被动语态和主动语态的时态要保持一致。
the floor is being swept by us
he is called robert by me
they have done the homework
she will clean the room
The floor is swept by us
He is called Robert
They have done the homework
She will clean the room
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