children could's have done all this damage怎么变被动语态?

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children could's have done all this damage怎么变被动语态?
children could's have done all this damage怎么变被动语态?

children could's have done all this damage怎么变被动语态?
All this damage cuold have been done by children.

all this damage couldn't have been done by children

This damage couldn't have been all done by children.
或All this damage couldn't have been done by children.