We must water these young trees ofen.(改为被动语态)

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Wemustwatertheseyoungtreesofen.(改为被动语态)Wemustwatertheseyoungtreesofen.(改为被动语态)Wemustwatertheseyoungt

We must water these young trees ofen.(改为被动语态)
We must water these young trees ofen.(改为被动语态)

We must water these young trees ofen.(改为被动语态)
the trees must be watered often.

These young trees must often be waterred

These young trees must be watered often by us.

These young trees must be water often.

These young trees must be watered often by us.

These young trees must often be watered by us(by us 可以省略的)

These young trees must be often watered by us.