the bird cost Jack fifty dollars改为否定句

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the bird cost Jack fifty dollars改为否定句
the bird cost Jack fifty dollars改为否定句

the bird cost Jack fifty dollars改为否定句
The bird didn't cost Jack fifty dollars.
(必须是didn't,因为主语the bird是第三人称单数,如果一般现在时的话谓语动词必须用第三人称单数,cost 要加s)

The bird didn't / doesn't cost Jack fifty dollars