问题标题：
【英语语法好的帮帮忙（初二的几套基础题）有奖分！！将下列句子改为否定句和疑问句：1.Ihavebeenwaitingheresince10o'clock.2.Wehavebeenreadingthistextfor10minutes.3.Theyhavebeensdandinghereforha】
问题描述：
英语语法好的帮帮忙（初二的几套基础题）有奖分！！将下列句子改为否定句和疑问句：1.Ihavebeenwaitingheresince10o'clock.2.Wehavebeenreadingthistextfor10minutes.3.Theyhavebeensdandinghereforhalfanhour.4.I'mtired.Ihavebeenwalkingallthemorning.5.TheWangshavebeenlivinginthishousesince1950.6.Shehasbeenpracticingtheviolinforanhourandahalf.7.Mymotherhasbeenlookingafterherfriend'schildalltheweek.
高琳琦回答：
将下列句子改为否定句和疑问句：1.Ihavebeenwaitingheresince10o'clock.Ihaven'tbeenwaitingheresince10o'clock.Haveyoubeenwaitingheresince10o'clock?2.Wehavebeenreadingthist...
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