Ben has been skating since nine o'clock.（改为同义句）Ben _____ _____ _____ at nine o'clock

Ben has been skating since nine o'clock.（改为同义句）Ben _____ _____ _____ at nine o'clock Alison has been skating for five hours. Sam has been skating for four hours.改为否定句 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__________. Ben has been to Singapore five times.five times划线提问（ ） （ ） （ ）has Ben been to Singapore? 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_____ _____ _____ 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 . Next is Sam ,and he has been skating for four hours The skating marathon has been going for five hours now中going表示什么,可以替换吗 How long has he been skating?答语三种,一个是for 一个是since（两种） ben likes ice-skating in winter .(改为一般疑问句) 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