(1)although与though可以引导让步状语从句,不能与but连用,但可以与yet连用.
Although they are poor,(yet)they are warm-hearted.
(2)even if或even though引导让步状语从句,表示"即使","纵然",用来使人注意下文所强调内容的性质.
I'll get there even if(though)I have to sell my house to get enough money to go by air.
(3)no matter后接上who、what、where、how等疑问词,也可以在这类疑问词后面加上ever构成whoever、whatever、wherever、however等.
Don't trust him, no matter what / whatever he says.
Whoever breaks the law will be published.
No matter how hard the work is, you'd better try to do it well.
(4)as也可以引导让步状语从句.要用倒装.
Child as(though)he is, he knows a lot.
Much as I like it, I won't buy.
Try as he would, he couldn't lift the heavy box.