before sb doing还是do sth如题```

before sb doing还是do sth如题``` help,open的过去分词是什么?是before sb do sth.还是before sb doing sth... mind sb do 还是doing keep sb doing还是keep sb do ? ? ? ? ? ? ? ? ? limit sb to do 还是to doing chanllenge sb to do 还是to doing? suggest sb +doing 还是 to do teach sb doing还是to do warn sb后跟to do 还是doing left sb to do还是doing love sb后跟to do 还是doing prefer sb not to do? 还是doing? leave sb.doing还是to do appreciate sb to do还是doing before doing sth还是do sth 是suggest sb to do 还是 suggest sb doing? notice sb do sth 还是 notice sb doing sth remind sb to do,还是remind sb doing sth?