sb is appinted as chairman中的 as 是不是可有课不可有可无

sb is appinted as chairman中的 as 是不是可有课不可有可无 as far as sb.is considered as far as sb be concerned,请问,sb可以换成sth吗?如：as far as learning is concerned 是 as is know to sb.还是as it know to sb. sb as well as consider sb as my best friend还是consider sb is my best friend as brave as sb和as brave as sb is那个正确如果都对两者又有什么区别brave能不能扩展为所有形容词 sb is as...as sb can 造句 sb and sb sb with sb sb as well as sbsb and sb sb with sb sb as well as sb 后面分别用三单还是复数 as sb.put treat sb.as... sb with sb+is sb and sb with sb +is sb and sb +are Paint sb as Out of be mistaken as sb翻译 appont sb as 中as 能否省略 As+adv+as sb can 的中文