assist sb in doing sth中in可否省略?

assist sb in doing sth中in可否省略? assist sb.to do sth.和assist sb.in doing sth.什么时候用assist sb.to do sth.什么时候用assist sb.in doing sth.最好能帮忙举个例子说明. 关于assist的一些词组的区别assist sb.with sth.assist sb.to do sth.assist sb.in doing sth.这三个词组的意思都是帮助某人做某事,它们有区别吗?区别在哪? absorb sb in doing sb engage sb in doing啥意思 sb have trouble (in) doing imagine sb doing imagine sb's doing有什么区别 resist sb doing还是resist sb's doing join sb in doing还是join sb doing in sb’s in sb's absence ask sb's help in doing 还是ask sb's help to do遇到这个题,虽然知道 ask sb todo something 可是加了个名词help 就傻了类似还有 ask sb's aid in doing/to do前面有一道题是 ask sb's aid in doing 因为 aid是名词 所以后面 join sb in doing sth 是什么意思? sb.spend time(in)doing sth. admit one's doing还是admit sb doing? mind sb doing sth和mind sb's doing sth都对吗?有哪些词可用sb' doing sb in doing sth 是there is nothing wrong with sb in doing sth hold sb.in one's powerhold sb in one's