if it were to rain tomorrow,the meeting would be put off..would后面为什么要加be丫?put不是动原么?

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if it were to rain tomorrow,the meeting would be put off..
would后面为什么要加be丫?put不是动原么?

会议是被推迟 要加be被动语态 Put的过去式和过去分词都是原型

被动啊。

put在这是过去分词
be+过去分词表被动
会议是被推迟

被动