Question

We hold staff meetings in this room. Change in voice

Answer 1

Heyaaaa....

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Staff meetings are held by us in this room.

$ Present tense - Am / Is / Are + V3 form

$ The subject comes to the place of the object and vice versa.

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Hope it helps...

And here CutieBarbie :)

Answer 2

Staff meetings are held in this room by us.
Object comes first, then verb and subject is last.