jack used to get up late.(否定)

问题描述:

jack used to get up late.(否定)

Jack usedn't to get up late.
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Jack didn't use to get up late.到底哪个两种改法都对。used 可作为助动词(第一种改法),也可作为实义动词(第二种改法)。一般来说多数人用第二种used to do sth 过去常常做某事