1 as 连词， 译为"虽然"，可以用于倒装句
2 常用句式
名词+as+主语+谓语
Child as he is, he's very brave，虽然他是个小孩，但是他很勇敢。此处要注意child的前面应用零冠词。
形容词+as+主语+谓语
Tired as he is He still insist on keeping a diary，虽然他很累，但他仍然坚持写日记。
动词+as+主语+谓语
Try many times as he might， he still failed，虽然他尝试了很多次，但最终还是失败了。
副词+as+主语+谓语
Hard as he worked, he didn't get good marks in the final examination.虽然他很努力，但是在期末考试中仍然没有取得好成绩。
as / though引起的倒装分三种情况：表语、动词原形及状语的倒装。
1. 表语的倒装
一般直接将表语提前到句首，若表语是带不定冠词a / an的单数可数名词，倒装后，不定冠词a / an须被省略。如：
Fine as / though he looks, he is ill with some serious diseases.
Child as / though he is, he knows much about the society.
2. 原形动词的倒装
A. 动词前面带有情态动词may, might, will, would, can, could等时，只将行为动词提到句首，而这些情态动词保留在原处。
B. 若动词前面没有情态动词时，应在动词原来的位置加上助动词do的适当形式。
C. 用于这一句型的动词一般是不及物动词，而不能是系动词或及物动词。如:
Swim as / though he can, he can’t swim so far.
尽管他会游泳，但是他游不得那么远。
Run as / though he did, he didn’t run fast enough to catch the bus.
虽然他跑，但是他跑得不够快而没有赶上汽车。
3. 状语倒装
In the classroom as / though he stays, he doesn’t read his texts.
尽管他呆在教室里，但他不读书。
Carefully as / though he worked, he made some mistakes.
尽管他工作很细心，但还是除了一些差错。