英语问题（大家帮帮我，谢谢~~！！！）
butIheardhersinginginherroomafewminutesago.butIheardhersinginherroomafewminutesago.bu...
but I heard her singing in her room a few minutes ago.
but I heard her sing in her room a few minutes ago.
but I heard she is singing in her room a few minutes ago.
为什么这三句话相等呢？ 请大家帮我解释一下，谢谢~~~~！！！ 展开
but I heard her sing in her room a few minutes ago.
but I heard she is singing in her room a few minutes ago.
为什么这三句话相等呢？ 请大家帮我解释一下，谢谢~~~~！！！ 展开
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hear sb doing sth和 hear sb do sth在意义上一样，只不过前者强调动作正在进行。第三句是个从句，在hear后省略了that,意思跟短语一样
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