look at the boy reading a book 和look at the boy is reading book 那个对?

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look at the boy reading a book 和look at the boy is reading book 那个对?

look at the boy reading a book 和look at the boy is reading book 那个对?
look at the boy reading a book 和look at the boy is reading book 那个对?

look at the boy reading a book 和look at the boy is reading book 那个对?
第一个对
动词的ing作the boy的补语.