no matter

• 别管他是谁

  no matter who he is

• 别管谁劝

  no matter who tries to persuade

• 别管是他不是

  regardless of whether it's him or not

• 别管是什么

  no matter what it is

• 别管怎么样, 工作总要做好。

  In any case, the work needs to be done.