1.Must the window be cleaned by us?
2.The sick people will be taken good care of by the nurse.
All the tests should be learned by the students by heart.
英语将下列句子中的主动语态变为被动语态
Must we clean the window?
--Must the window be cleaned?
The nurse will take good care of the sick people.
--The sick people will be taken good care of by the nurse.
The students should learn all the texts by heart.
--All the text should be learned by heart (by the students).
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