1. as作為連詞可引導方式狀語從句,意為“象……一樣”,例如：
Remember, you must do everything as I do. 記住,你們務必照我的樣子去做每一件事.
But Americans still talk about “fall” just as people do in some parts of western England. 但是美國人還是說 “fall”,就象英格蘭西部有些地區(qū)的人現(xiàn)在說 “fall” 一樣.
2. as作為代詞, 通常以the same…as,such…as或as…as…的形式引導定語從句,as在定語從句中作主語、賓語或表語,例如：
作主語：As is known to all, coal is first discovered in China. 眾所周知,煤是最先在中國發(fā)現(xiàn)的.
作主語：As many people as were present knew the news. 在場的人都知道這條消息.
作主語：Repeat this as often as is necessary. 重復做這種動作的次數(shù)視需要而定.
作賓語：Such people as you mention are rare nowadays. 你提到的那種人如今很少了.
作表語：He is not (= no longer) the same man as he used to be. 他再也不是從前的他了.
3. as意為“當……”,引導時間狀語從句；as強調(diào)主句動作與從句動作同時發(fā)生,通常譯為“一邊……一邊……”,例如：