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be动词加过去分词属于被动语态的结构，表示被动的动作。此时的be动词不叫系动词，而是助动词，已经完全丧失了系动词的一切功能，只作为语法变形的辅助工具存在。
be动词加过去分词例句
1.The meeting will be held next Friday. (be+ held)
会议在下周五召开。
2.Anyone who breaks the law has to be punished by law. (be + punished)
任何违反法律的人必然受到法律的惩罚。
3.He was brought up by his grandparents. (was + brought)
他是由祖父母养活成人的。
4.Those letters were wirtten by a famous writer.
那些信是由一位有名作家写的。
5.I was taught by Miss Zhao last year.
去年，我是由赵老师教的。