1、所有时态都是通过动词变化来表现的


肯定句:had
否定句: didn't have
一般疑问句: did ... have
简略回答: 肯定定回答did, 否定回答didn't




肯定句:had
否定句: didn't have
一般疑问句: did ... have
简略回答: 肯定定回答did, 否定回答didn't


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