hear sb.doing和to do的区分以及复合从句I heared her singing in the next room just then.为什么是"doing“呢?just I think it imporant to take exercise every day.复合从句加+It is adj.to do sth为什么要去is?

Hear sb to do sth 和 hear sb doing sth hear sb doing ,hear sb do ,hear sb to do（有这样的吗?）区分 hear to do和hear sb.doing这些短语对吗 hear sb do 和hear sb doing 差别 hear sb do hear sb doing区别 hear that 和hear sb do/doing 有什么区别? hear sb do和hear sb doing的区别Do you often hear John____in his room?-yes.Listen!Now wo can hear him____in his room.A sing;to sing B singing;singing C sing;singing D to sing;singing hear sb do sth和doing sth有什么区别有to do sth吗 make sb.doing和make sb.to do的区别 see sb to do和see sb doing的区别? teach sb.to do和teach sb.doing的区别 allow sb.to do和 allow sb.doing 的区别 watch sb do和watch sb doing的区别是什么 hear也是这样用么? 是hear　sb to do sth 还是hear sb doing sth 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 do sth 有什么区别?哪个是全过程的?是hear sb doing sth 和 hear sb do sth 有什么区别？ hear to do hear doing