avail oneself怎么用法?

avail oneself怎么用法? avail oneself of sth. avail的用法 avail的用法 “oneself”的用法?要有例子, teach oneself还有什么用法 to oneself,by oneself,for oneself用法这3个词组的用法和区别是? on oneself与in oneself的意思用法 do sth oneself和do sth by oneself用法区别 help oneself怎么读 seated oneself怎么翻译? oneself怎么读 关于反身代词的用法问题.Avail yourself of every opportunity to enrich your knowlege中的yourself 怎么理解.关于反身代词的这种用法一直不太明白.请高手指点下最好给些例子. concern词组concern aboutconcern withconcern oneself aboutconcern oneself inconcern oneself with不同点,及用法 by oneself ,on oneself,for oneself 和on one's own,by one's own ,for one's own等等的区别?好像都差不多啊,都怎么用的?有什么固定用法?尽量详细点, leave sb.by oneself的用法 find oneself doing sth请解释用法 英语 keep to oneself的用法