when sb doing sth,sb doing sth 这个句型可不可以?

when sb doing sth,sb doing sth 这个句型可不可以? when sb.do sth.还是 when sb.doing sth. There is sb doing sth.这个句型的用法 stop sb to doing sth 用这个句型造句 请问有没有sb.be there +doing sth.这个句型? 请问有否want sb.for doing sth.这个句型? want sb doing sth 没有这个句型吧? 关于There be sb/sth doing句型 sb was doing sth see sb.doing sth. sb in doing sth help sb doing sth