his father is sitting at the desk,reading a story-book.中为什么用

来源：学生作业帮编辑：百度作业网作业帮分类：英语作业时间：2024/04/30 04:11:46

his father is sitting at the desk,reading a story-book.中为什么用reading 不用is reading 或 read

用reading表示伴随状态,也就是说reading这一动作伴随着sitting,他们同时发生,句意是：他的爸爸坐在桌子旁,正看一本故事书.
再问：为什么不用is reading，这本来是一个选择题，有reading ,read, is reading这几个选项，能解释的更详细一点吗？老师让我们解释。急啊！！谢啦啊
再答：用is reading的话，就另外成句了，前面要加主语，以及连接词。

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