before sb doing还是do sth

before sb doing还是do sth help,open的过去分词是什么?是before sb do sth.还是before sb doing sth... before doing sth还是do sth tell sb doing sth还是tell sb to do sth when sb.do sth.还是 when sb.doing sth. hear sb doing sth.还是hear sb do sth. keep sb do sth 还是keep sb doing sth? take sb.doing sth.还是take sb.to do sth. notice sb do sth 还是 notice sb doing sth show sth.to do sb.还是show sth.do sb.还是show sth.doing sb. make sb to do sth还是make sb doing sth还是make sb do sth ask sb do sth 、ask sb doing sth还是ask sb to do sth