He is going to buy a science book.

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He is going to buy a science book.

He is going to buy a science book.
He is going to buy a science book.

He is going to buy a science book.
He is not going to buy a science book.

He is not going to buy a science book.在is后面加个not就OK了

He is not going to buy any science book.

He will not buy a science book.