The mp4 cost John a lot of money.改为否定句

The mp4 cost John a lot of money.改为否定句
The mp4 cost John a lot of money.改为否定句

The mp4 cost John a lot of money.改为否定句
The mp4 didn't cost John a lot of money.
注；cost 是过去式哦,因为主语是第三人称单数,而COST 不变
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The mp4 didn't cost John any money.