特殊疑问词+ever=no matter+?

what/who/which/when/where/how+ever 表示无论何物、何人、哪个、何时、何地,可以引导名词性从句和状语从句
no matter + what/who/which/when/where/how 意思同上,但只能引导让步状语从句,不可引导名词性从句.
因此,可以用no matter + what/who/which/when/where/how 的地方,都可以用what/who/which/when/where/how+ever代替,反之则不一定.
例：You shouldn't give your child whatever he wants 这里是宾语从句,只能用whatever,不能用no matter what.

特殊疑问词+ever=no matter +特殊疑问词

特殊疑问词+ever=no matter wh- 例如：whatever=no matter what
wherever=no matter where however=no matter how ...