一般来说：
1 No matter what you do,you must do it well (变成两个句子,中间有逗号)
==Whatever you do you must do well (==You must do well whatever you do).
（就一个句子）
2 No matter who has broken it,he has to pay for it.（两个句子）
== Whoever has kroken it has to pay for it (一个句子)