请问hear sb doing sth这里sb是主格还是宾格?还有一题-Where is Mary now?-I heard__in her room just nowA her singing B her sing C she was singing D All the answers are right请问该选什么?I heard__in her room just now刚才没打全

hear sb doing sth 造句 Hear sb to do sth 和 hear sb doing sth see/hear sb.doing sth.造句 用hear sb doing sth 造句 hear sb.doing sth.是神马意思? 帮我分辨这两个句型的区别see/hear sb do sthsee/hear sb doing sth watch/see/hear+sb+do sth 和watch/see/hear+sb+doing sth 是hear　sb to do sth 还是hear sb doing sth hear sb do sth 和 hear sb doing sth 有什么区别? 恩 hear sb doing sth hear sb do sth 怎么造句啊 是hear　sb to do sth 还是hear sb doing sth hear sb doing sth 与hear sb to do sth有什么区别 hear sb.do sth.和 hear sb.doing sth.怎么使用? see/hear/watch sb doing sth 这个语法对吗? see/hear sb.doing sth.造句（注中文） hear sb do sth和doing sth有什么区别有to do sth吗 请问什么时候用 see sb doing sth 什么时候用 look at sb doing sth什么时候用 watch sb doing sth Suddenly,we heard someone shouthelp!help这里为什么用hear sb do sth 而不用hear sb doing sth