Sam has been swimming for fuor hours (改为否定句）

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• Sam has been swimming for fuor hours (改为否定句）
• Sam has been skating for four hours.改为否定句
• Sam has been swimming for fuor hours (改为否定句）
• Sam has been skating for four hours.改为否定句
• 问个英语句型转换I have been skating for two hours.（改为一般疑问句）____ you _____ _____ for two hours?He has been working since an hours ago（改为否定句）He ___ ___ ____ since an hour agoHe started playing the piano (six years ago)（对括号的部分提问）_____ _____ he _____ playing the piano?
• 根据括号内的要求完成下列各句,每词一空（含缩写）1·I have been skating for two hours （改为一般疑问句）（ ）you（ ）（ ）for two hours?2·He has been working since an hour ago.(改为否定句)He （ ）（ ）（ ）since an hour ago 3·He ran for three hours.（对划线部分提问）（ ）（ ）（ ）he （ ）4·Jim got his favorite book on Children’s Day.（对划线部分提问）（ ）（ ）Jim （ ） his favorite book?5·I have been collecting leaves for two years.（改为同义句）I have been collecting leaves( )( )( )( )
• 请问：I have lived here for ten years.(我已住这儿十年了,以后可能还会住下去）这里为什不用现在完成进行时态,而用现在进行时?上面写反了。【现在完成进行时】：表示从过去某时开始一直持续到现在的动作，并且还将持续下去。【现在完成时】：过去某一时间开始并一直持续到现在并且有可能还会持续的动作或状态。为什么不用【现在完成进行时】？
• She will practice the paino for four hours this week.(对划线部分提问)（对for four hours提问）_____ _____ _____ she practice the paino this week?