San skated for four hours 对划线部分提问

San skated for four hours 对划线部分提问 he skated for four hours 为什么加for I skated for four hours与I have been skating for four hours的区别最好详细点,说的明白点 my brother skated for the w___two hours yesterdayRT. I skated but I fell down for many He's been studying there for （two whole hours）?对括号提问I missed the train （an hour ago） （ 同上）He skated from 7:00 to 9：00 yesterday （同上）He has been skating for four hours （否定句）He ___ ____ ____ for four hours San how long did you skate?--I skated for two years.请帮忙分析一下此句话的语法I skated for two years.I have skated for five years两句有什么区分 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 How long has alison been skating?How long has alison been skating?She's been skating for five hours.How long did sam skate?he skated for four hours.我要解释的是那四句 因为本人英语差 所以请你们告诉哈我 回答了还有加分 Jim skated _______a marathon last year.A.at B.in C,on D.for for一four Four zeros for you four people for two 英语比较厉害的 关于 have been 的用法的~have been do sth.have been doing sth.有什么区别?比如：I skated for 4 hours.和 I have been skated for 4 hours.有什么区别? Alison,c____winning the skating My brother skated for the w___ two hours yesterday.We started classes an hour a____. how long did you skate?I skated for two years.是持续的时间为何不用过去完成时. made in china for san francisco candle company什么意思