用一個句子作狀語,這個句子就是狀語從句。狀語從句通常用來修飾句子、動詞或形容詞,表示時間、地點、條件、原因、目的、結果、方式、比較等。引導狀語從句的連詞叫從屬連詞。
在句中用作方式狀語的從句叫方式狀語從句。引導方式狀語從句的從屬連詞主要有as,as if,as though等。
(1)as引導方式狀語從句意為“按照;像……”;as引導的方式狀語從句通常位于主句后,但在(just)as ...so ...結構中位于句首,這時as從句帶有比喻的含義,意思是“正如……;就像”,多用于正式文體。如:
You should do as I told you.你應當按我告訴你的去做。
You must try to hold the tool as I do.你必須像我這樣拿工具。
Just as we sweep our rooms,so we should sweep backward ideas from our minds.正如打掃房屋一樣,我們也要掃除我們頭腦中落后的東西。
(2)as if引導方式狀語從句意為“仿佛;好像”。
I remember the whole thing as if it happened yesterday.整件事我記得很清楚,就仿佛是昨天發(fā)生。
He behaves as if he were a child.他的舉止就像個孩子。
(3)as though引導方式狀語從句與as if意思相同,意為“仿佛;好像”。如:
He closed his eyes as though he were too tired.他閉著眼睛,好像太累了。
He looked about as though he was in search of something.他四下張望,好像尋找什么。