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.
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