sb is doing sth.这是表现在进行时 那么 这是主系表结构吗?

sb is doing sth.这是表现在进行时 那么 这是主系表结构吗? sb in doing sth 是there is nothing wrong with sb in doing sth find sb is doing sth有错吗 只能是find sb doing吗 There is sb. doing sth.是什么意思 用there is sb /sth doing sth,stop sb (from) doing sth造句 convenient for sb to do sth convenient of sb doing sthit is convenient to do sth这几个哪些是对的? 到底是approve of sb's doing sth还是 approve of sb doing sth?这两者有区别吗 like sb 【 】 sth是to do 、doing? hear sb.doing sth.是神马意思? when sb doing sth,sb doing sth 这个句型可不可以?这个句型可不可以?如果可以,在什么时候使用?when sb doing sth,sb do sthwhen sb do sth,sb doing sthwhen sb do sth,sb do sth这几个呢? help sb doing sth sb doing sth是什么意思? stop sb doing sth suggest sb doing sth sb spend + doing sth sb was doing sth find sth+do还是doing,是find+sth不是sb learn doing sth from sb.的疑问是learn doing sth from sb 还是learn to do sth from sb?