No matter what happened, he would not mind. (=Whatever happened, he would not mind.)无论发生了什么，他都不会介意的。
No matter who you are, you must keep the law.(=Whoever you are, you must keep the law.不管你是谁，你都要遵纪守法。
但"no matter+疑问词"结构只能引导让步状语从句，而"疑问词-ever"还可以引导名词性从句。例如：
Whatever (=No matter what) you say, I won't believe you. (Whatever 引导让步状语从句)无论你说什么，我都不会相信你。
I'll eat whatever (≠no matter what) you give me. (whatever引导宾语从句)你给我吃什么，我就吃什么。
Whoever comes will be welcome. (Whoever 引导主语从句) 不管谁来都受到欢迎。
此外，有时while也可以引导让步状语从句，但一般要位于句首。例如：
While I like the colour, I don't like the shape.我虽然喜欢那颜色，但不喜欢那形状。
综上所述，我们可以看出，学习让步状语从句的关键是关联词的选用；其次，要注意的是由as引导的让步状语从句要用倒装语序。
让步状语从句表示：虽然，尽管，即使等概念，由although（尽管）, though（尽管）, however（无论怎样）, whatever（无论什么）, whoever（无论谁）, whomever（无论谁）, whichever（无论哪个）, whenever（无论何时）, wherever（无论哪里）, whether（是否）, no matter (who, what, where, when, etc) （无论……）, even if（即使）, even though（即使）等词引导。
如： We won't be discouraged even if(=even though) we fail ten times.我们就是失败十次也不泄气。
It was an exciting game, though / although no goals were scored.那是一场精彩的球赛，尽管一个球都没进。(though, although不能与 but连用)
Whether you believe it or not, it's true.不管你信不信，这是真的。
However (=No matter how) expensive it may be, I'll take it.无论它有多贵，我也要买下它。
Don't let them in, whoever(=no matter who) they are.不管他们是谁，别让他们进来。
No matter what I say or how I say it, he always thinks I'm wrong.无论我说什么或怎么说，他总认为是我错。
特别提醒
1.no matter
what（who，which，when，etc。）与whatever（whoever，whichever，whenever，etc。）的区别：
当引导让步状语从句时，两者相同，可以互换，但当引导名词性从句（主语从句，宾语从句，表语从句和同谓语从句）时则只能用whatever（whoever，whichever，whenever，etc）。如上面最后两个例句可改为：
e．g． However pure the water looks，I do not want to drink it。
I want to marry the man I love， no matter who he may be。
下面句字不能用no matter结构:
Whoever comes back firs is supposed to win the prize.(主语从句)
I am ready to do whatever you want me to .（宾语从句）
例证：
Whatever you did, I will accept.为让步状语从句.
I will except whatever you did.为宾语从句.
2. as 引导让步状语从句的用法：
引导让步状语从句时，as意为"虽然，尽管"，通常从句要倒装，倒装的方法是将从句的表语或状语放在as之前，而用though引导让步状语从句时句字则不必倒装（口语中也可倒装）。liuxuepaper.com