sb doing sth是什么意思?

sb doing sth是什么意思? for sb doing sth是什么意思? want sb doing sth是什么意思? There is sb. doing sth.是什么意思 join sb in doing sth 是什么意思? stop sb from doing sth 是什么意思? sb was doing sth see sb.doing sth. sb in doing sth help sb doing sth have sb doing sth suggest sb doing sth