核心问题
He took care of the children.
请问这个句子的被动形式如何构成？
词典解答
take care of 句型有两种被动形式：
A. 用 care 作被动句主语:
Care was taken of the children by him. 由他照管孩子们。
B. 用 of 的宾语作被动句主语：
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The children were taken care of by him. 孩子们由他照看。
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All his medical expenses were taken care of by the state. (Mis) 他的医疗费全部由国家负担。
(参见 agree on)