I spent ten yuan on this book.改为否定句I spent ten yuan on this book.改为否定句

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I spent ten yuan on this book.改为否定句
I spent ten yuan on this book.改为否定句

I didn't spend ten yuan on this book.
用助动词 do 的否定形式.因为原句是过去时,所以用 didn't
另外,助动词后面都要跟动词原形,所以用 spend

I didn't spend ten yuan on this book. 用didin't 就可以了