no matter + wh-clause可以引导让步状语从句，从句应用陈述句语序。相当于wh-ever,但是wh-ever还能引导名词性从句。
Whenever/No matter when you leave the room, don’t forget to turn off the gas.
无论你什么时候离开房间，不要忘记把煤气关上。
No matter who told you about some news, you can’t make any comment on it before you check it up.
不管是谁告诉你什么新闻，你都应该核实后再作评论。
