引导让步状语的引导词主要有though, although, even if(though)(即使), as(尽管), while(尽管), whether…or(不管….还是), what/which/when/how/who+ever(不论什么、哪个、何时、怎样、谁), no matter+what/which/when/how/who(不论什么、哪个、何时、怎样、谁), for all (that) (尽管), in spite of the fact that(尽管), despite the fact that(不管)
  (1)though, although引导的让步状语从句,不能有but,但是 though 和yet可连用。例如:
  Although it's raining, they are still working in the field. 虽然在下雨,但他们仍在地里干活。
  It's raining, but they are still working in the field. 虽然在下雨,但他们仍在地里干活。
  Though the sore be healed, yet a scar may remain. 伤口虽愈合,但伤疤留下了。
  (2)as引导的让步从句必须把表语或状语提前,可提至句首的有名词、原形动词、副词、形容词等。可数名词单数形式不用冠词。如:
  Child as he is, he behaves like a grown-up.
  Fail as he did, he was not disappointed at all.
  Much as I tried, I failed to persuade him.