您好!
is reading （be + Ving）是现在进行时的标志.表示目前正在做某事.
而 reads 是一般现在时,表示经常性发生的动作等.
两者时态上不一样.
请采纳,谢谢!
she is reading a book中为什么read前面要加be动词?如果是she reads a book
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