Sam has been skating for four hours.改为否定句

Sam has been skating for four hours.改为否定句 Next is Sam ,and he has been skating for four hours Alison has been skating for five hours. 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 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 The skating marathon has been going for five hours now,and several skaters are still skating The skating marathon has been going for five hours.改为同义句 The skating marathon_________five hours__________. He has been skating since.的同义句He has been skating_____ _____ _____He has been skating since two hours ago.的同义句He has been skating_____ _____ _____ since 和 for①I’ve been running （half an hour ago/for half an hour）②Sam has been skating(since 9 o'clock/an hour ago)③-When did you get the first stamp?-(For six years/Six years ago) He has been skating for five hours.(用since改写句子) He has been skating___ ___ ___ ___ The,has,skating,marathon,been,for,going,hours,five,now.(连词成句) The skating marathon has been going for give hours now.求翻译这里的going是什么意思？ Alison was the first one to start and has been skating for the whole five hours Alison has been skating since five hours ago 对划线部分提问 还有一个噢,How long has he been skating?也是答语三种哦 . what does Sam collect?He___stamps A.collected B.is collecting C.has been collecting D.collects Sam has been swimming for fuor hours (改为否定句） Ben has been skating since nine o'clock.（改为同义句）Ben _____ _____ _____ at nine o'clock