just now I heard students 【singing】in the classroom .为什么用sin

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/09/14 06:38:22

just now I heard students 【singing】in the classroom .为什么用singing,而不用sing?
just now I heard students 【singing】in the classroom .
为什么用singing,而不用sing?

因为hear 加doing的时候表示正在听到
译：刚刚我听到学生在教室唱歌.
强调我听到刚刚学生正在唱歌
而如果用do,则强调听到学生唱歌的过程.语境中没有体现出来.

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