How long did you sleep last night?什么意识

还有When did you start class today?
how long have you been in class today?
How long has Alison been skating?
she's been skating for five hours.
How long did Sam skate?
He skated for four hours. 是什么意识 帮我翻译 谢谢了

How long did you sleep last night?你昨晚睡了几个小时？
When did you start class today? 你今天什么时候开始上课的？
how long have you been in class today? 你在教室（上课）多久了？
How long has Alison been skating? 艾莉森滑冰滑了多久了？（还在持续当中的动作）
she's been skating for five hours.她已经滑了5个小时了。
How long did Sam skate? 萨姆滑了有多久？（发生在过去，已经完成的动作）
He skated for four hours. 他滑了四个小时。

已经有did在前面了，动词就用原型，而不用过去时态。did已经表示sleep这个动作是过去发生的了，所以不能再用slept，否则就是重复，是不对的。用汉语解释的话就是说“昨晚你睡了多久？” 不能再累赘的说成“昨晚你已经睡了多久？” 这里的“了”和“已经”是一个意思，都表示动作已经发生。“已经”就像“did”，“ 了”就像“slept”这个变型。这么说你明白了么？ 参考资料：自己理解的

How long did you sleep last night? 昨晚你睡了多长时间? When did you start class today? 今天你几点上的课? how long have you been in class today? 今天你在教室呆了多长时间? How long has Alison been skating? 艾莉森滑冰滑了多久? she's been skating for five hours. 她一共滑了5个小时 How long did Sam skate? 山姆滑冰滑了多长时间? He skated for four hours. 他滑了有4个小时

How long did you sleep last night 你昨晚睡了多久 When did you start class today? 今天你什么时候开始上的课 how long have you been in class today?你今天上课上了多久 How long has Alison been skating?Alison滑了多长时间的冰 she's been skating for five hours.她滑了5个小时的冰 How long did Sam skate?错误说法,应该是: How long has Sam skated?滑Sam冰滑了多久 He had skated for four hours. 他滑了4个小时的冰

How long did you sleep last night? 你昨晚睡多久？ When did you start class today? 你今天几点开始上课？ how long have you been in class today? 你今天上了多久的课？ How long has Alison been skating? 艾利森滑雪滑了多久？ she's been skating for five hours. 她滑了五个小时。 How long did Sam skate? 森滑了多久？ He skated for four hours. 他滑了四个小时。