让步关系是SAT官方逻辑考点中非常喜欢考察的知识点。由于表示让步关系的词(如though，although，despite，while等)都可以翻译成“尽管”，许多学员在做题的过程中只注重语意，而不注重词性，这在解题过程中会造成很多的困惑。比如这道题：

　　Though the damage caused by strip-mining was often irreparable to the natural environment, it was once used to supply half the coal produced annually in the United States.

　　(A) Though the damage caused by strip-mining was often irreparable to the natural environment, it

　　(B) Though irreparable damage is caused often to the natural environment by snip-mining, it

　　(C) Though strip-mining often caused irreparable damage to the natural environment, it

　　(D) Despite the fACT of often irreparable damage to the natural environment, strip-mining

　　(E) Despite strip-mining often caused irreparable damage to the natural environment, it

　　原句说：尽管露天开采会给环境带来不可修复的破话，它仍一度被用来开采美国一半的产煤。这个题目重点考察it对于主语也就是strip-mining的指代，很容易就可以选出答案(C)。但是很多学员会疑问，为何不选择(E)。这样的困惑，就要求我们在讲解是必须对让步关系词从词性上进行分类。

　　总的来说，让步关系词可以分为介词和连词两类，介词类后面应该接名词，连词类后面应该承接完整句子。介词类的让步关系词有：despite， in spite of和for all。其中for all 对于学员来说比较陌生，一定要重点强调，07年1月真题的第10题即是对for all的考察。题目原句是For all their talk about ecology, major companies have so far spent very little to fight pollution.只要理解了for all 语意是尽管又是介词属性，那么这个题目可以很清楚的看出原句无需改动。 连词类的让步关系词有：though，although，as和while以及even if, even though。其中as引导让步状语从句时候需要倒装是学员们困惑的点。 同样出现在07年1月考试中，第29题难倒了无数的考生。题目如下：

　　An amateur potter herself(A), the accountant offer to help(B()) the artist with his business accounts, com-plicated as they were(C) by(D) his unusual System of record keeping. No error

　　本题很多学生因为看不懂题意而乱选C。事实上，看不懂的原因正是因为没as引导让步要倒装的知识点，complicated本来是从句的表语却出现在连词as 的前面。这正是as引导让步状语要倒装的必然要求。

　　借此，们还需学生记住两条。As 引导让步状语从句时候：1，副词和形容词通常提到as前面，如 Old as he is, he works hard. 2,当从句的表语是可数名词单数时通常省略冠词，如，Handsome boy as he is, he can get a girlfriend.

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