won't 是 will not的所写,表示一般将来时的否定形式；
didn't 是did not的缩写,表示一般过去时的否定形式；
两者表达的时态不同；
比如：I won't come tomorrow.我明天不会来.
I didn't come yesterday.我昨天没有来.
won t的用法 won t与didn't的区别
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