according the dictionary,I heard him leave=he was heard to l

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according the dictionary,I heard him leave=he was heard to leave?
according the dictionary,"I heard him leave= he was heard leaving
=he was heard to leave".From Webster dictionary
just know I ask a question like this:
I heard him sing in the classroom改为
被动语态?
I think both he was heard sing or he
was heard to sing are correct,is that
so?

leave 和 sing 不是一类动词.你应该明白这点
leave 是瞬间动作,不能有表示持续性的含义,这类动词的-ing 形式是表示将来的意思
即：i am leaving. 不是我一直在离开的意思, 而是说我将要离开
,其他如：go,come,etc.
sing 是可以有持续性意思的,表示“一直”
如：i am singing. 就是说我一直在唱歌.
然后再然就你的问题,就easy 了.
个人建议：使用字典是好事,但是别死搬里面的规律,有时候需要你灵活运用.

according the dictionary,I heard him leave=he was heard to l he was heard singing=he was heard to sing? He was ____________to leave as soon as he heard the news. 翻译英语被动句 I HEARD HER SING THE SONG JUST NOW SHE WAS HEARD TO I heard him singing there改被动句是heard singing还是heard to sing I heard he was singing in the next room.I heard —— ——in the Suarez heard that Chelsea wanted him to play for them.He was she was heard to in the room He is the man from him I heard the news,改错 I have never heard him compain.he is always willing to help怎 I have never heard him complain.He is always willing to help when one of his w_______student heard that he was going to l