1、一、是否可用倒装结构不同as引导让步状语从句时，句子必须倒装，形容词提前。
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2、如：Poor as he was，he was honest.虽然他穷，但是他诚实。
3、2、though可同as那样倒装，形容词提前。
4、如：Poor though he was，he was honest.（相当于Though he was poor）虽然他穷，但是他诚实。
5、3、although不可用于倒装结构。
6、although“尽管；虽然”，只作连词，较正式，一般情况下可以用though替代。
7、如：He passed the exam although illness prevented him from attending class.虽然他曾因病耽误了学习，但他考试还是及格了。
8、Although he was seriously wounded, he still held out on the battle—field.他虽然身负重伤，但坚持不下火线。
9、二、用作副词用法不同as 用作副词的意思是“如同，像……一样”。
10、如：As always, he said little.他和平时一样，少言寡语。
11、2、although 一般不用作副词。
12、3、 though 可用作副词，且一般放在句末(不放在句首)，意为“可是”、“不过”。
13、如：I can see that New York must seem dull to her,though the family won’t admit it.我看得出来纽约对她来说一定很单调乏味，虽然家里人不愿承认这一点。
14、She won’t leave the TV set,even though her husband is waiting for his supper.即使丈夫等着吃饭，她也不愿意离开电视机。
15、三、习语中用法不同在 as though(好像，仿佛)可用于固定短语。
16、如：She closed her eyes as though she were tired.她闭上眼，仿佛很疲劳似的。
17、We felt as though we had witnessed the whole thing.我们感到仿佛目击了整个这件事似的。
18、2、固定短语中不能用 although。
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