We must protect our earth well.(改为被动语态) Our earth must___ ___by us well.

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Wemustprotectourearthwell.(改为被动语态)Ourearthmust______byuswell.Wemustprotectourearthwell.(改为被动语态)Ourea

We must protect our earth well.(改为被动语态) Our earth must___ ___by us well.
We must protect our earth well.(改为被动语态) Our earth must___ ___by us well.

We must protect our earth well.(改为被动语态) Our earth must___ ___by us well.
be protected
情态动词的被动:情态动词加be done