一、在引导让步状语从句时,两者都可以.如: Don't let him in, whoever(=no matter who) he is. 在引导名词性从句时,只能用whoever.如: Whoever commits the crime shall be sentenced to ten years in prison. 任何人犯了此罪就要被判处十年徒刑. Whoever told you that was lying. 二、to be exact意为“确切的说”,相当于xactly speaking.