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引导名词性从句且在从句中作主语时，who意为“谁”，含有疑问意味；whoever意为“无论谁”，不含疑问意味。whoever在引导名词性从句时，相当于anyone who，其中who引导一个定语从句紧随其后。另外whoever还可以引导让步状语从句，这时whoever相当于no matter who。
具体用法
（1）Who has taken away my bag is unknown.
不知道是谁拿走了我的包。
（2）Whoever comes will be welcome.
=Anyone who comes will be welcome.
无论谁来都欢迎。
（3）I’m not going to let you in,no matter who you are.
=I’m not going to let you in,whoever you are.
我怕不会让你进去的，不关你是谁。
2.wh-+ever
（1）引导名词性从句：whoever=anyone who
whomever=anyone whom
whatever=anything that
whichever=anything that
whosever=anyone whose
（2）引导让步状语从句：whoever=no matter who
whomever=no matter whom
whatever=no matter what
whichever=no matter which
whosever=no matter whose