how long has Alison been skateing?与how long did Sam skate的区别

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/10/06 03:18:14

how long has Alison been skateing?与how long did Sam skate的区别
how long has Alison been skateing?与how long did Sam skate?的区别.简易点.复制的绕道.

how long has Alison been skateing?艾莉森滑冰多久了?是以现在的时间为切入点看问题的,用了现在完成进行时,滑冰的动作现在还在进行着,有可能还要进行下去；而how long did Sam skate?当时艾莉森滑冰滑了多长时间?是对过去发生的动作的累计时间进行询问的,是纯粹的过去的客观事实,与现在无关,并且滑冰的动作已经结束.
再问：那一般怎么回答呢？
再答： how long has Alison been skateing?----->Alison has been skating for two hours.或For two hours. how long did Sam skate??----->Alison skated for two hours.或For two hours.

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