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

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

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

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.

因为前面有is 中间用逗号 时态一致 reading 正解