as引导的这种让步状语从句语气比较强，语体正规，经常用于书面语言，意为“尽管，虽然”。从句需要进行倒装。
其倒装构成形式见下表。
| 基本构成形式 | 例 句 | 有 关 说 明 |
表语＋as＋主语＋系动词 | 1.Young as he is，he is equal to the task. 2.Crowded as the restaurant was，they tried to find a table. 3.Child as he was，he knew what was the right thing to do. 4.Difficult as was the work，they finished it in time. | 1.表语经常是由形容词、分词、或名词充当；2.名词用作表语时，其前不能 加用冠词；3.从句的主语是名词时，其主谓语序要倒装。 |
状语＋as＋主语＋谓语动词 | 1.Hard as he studied，he did not get good marks in the exam. 2.Early as we got there，our teacher was there before us. | 这一结构中的谓语动词一般是行为动词，即可以是及物动词（带宾语）也可以是不及物动词。 |
动词＋as＋主语＋…… | 1.Search as they would，they could find nothing in the house. 2.Try as he may，he will fail in the examination. 3.Die as he did，his inspiration lived on. 4.Lose money as I did，I got a lot of experience. 5.Fail as he did，he would never give up. | 在这一结构中，主语后面一般加上情态动词may，might，will，would，can，could等，句首的动词应该使用原形。如果从句中没有情态动词，那么，应在从句的主语之后（根据时态和数要求）加上助动词do，does，或did。在这一结构中，放在句首的动词如果是及物动词，那么，这个动词连同它的宾语一起放到as之前。 |
分词 + as + 主语 +助动词 | 1.Standing as it does at the top of the hill， The temple is well preserved. 2.Living， as I do，so remote from town，I have many vistors. 3.Hidden as it is by the trees，the tower can scarcely be seen. | 在这一结构中，若现在分词提前时，主语之后根据具体的时态和数需放置一个助动词（did，do，does）；若过去分词提前时，主语之后需放置be动词（am，is，are，was，were）。 |
■使用as引导让步状语从句时，还应注意以下几点：
1.这类让步状语从句一般应置于主句之前，但有时也可放在主句之后或插入到主句之中。
e.g. He would do it，forbidden as he was.
The book，masterpiece as it is，is far from popular.
2.这类让步状语从句中的as有时也可以换用成though；如果表语是名词时还可以用that来替代。
e.g. Disabled though（=as）he is，he tries his best to serve the people.
Lover of towns that（=as）I am，I realize that I own a great debt to my early country life.
Patient though（=as）he was，he was unwilling to wait three hours.
3.有时as表示原因时也可使用倒装结构，这时应注意as表示原因与表示让步的区别，其辨别方法主要是根据句子的意义。
e.g. Busy as she is，she cannot attend the meeting. （原因）
Busy as she is，she works hard at English. （让步）
Fast as he read，he finished the book in time. （原因）
Fast as he read，he could not finish the book in time. （让步）
4.注意下列几种说法，意义基本相同：
Rich as （though） he is，I do not envy him.
（Al）though he is rich，I do not envy him.
However rich he may be，I do not envy him.
No matter how rich he is，I do not envy him.
I do not envy him，even though he is rich.下载本文
