he wasn't heard to sing in the classroom.为什么是to sing,不是singi
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he wasn't heard to sing in the classroom.为什么是to sing,不是singing或其他
![he wasn't heard to sing in the classroom.为什么是to sing,不是singi](/uploads/image/z/262669-13-9.jpg?t=he+wasn%27t+heard+to+sing+in+the+classroom.%E4%B8%BA%E4%BB%80%E4%B9%88%E6%98%AFto+sing%2C%E4%B8%8D%E6%98%AFsingi)
还原一下句子:We didn't hear him sing in the classroom.
句子使用了 hear sb do sth 改为被动语态是:sb be heard to do sth,
如果原句是:We didn't hear him singing in the classroom.
改为被动语态就是:He wasn't heard singing in the classroom.
句子使用了 hear sb do sth 改为被动语态是:sb be heard to do sth,
如果原句是:We didn't hear him singing in the classroom.
改为被动语态就是:He wasn't heard singing in the classroom.
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