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bofang112
i know the boy ( ) is tall and handsome. 做主语。 从句中,the boy is tall and handsome.
I bought a book ( ) sells well. 做主语。在从句中, thebook sells well.
I know the boy ( ) he is talking with. 做宾语,在从句中,he is talking to the boy.
I bought a book ( ) he wrote. 做宾语,在从句中,he wrote the book.