如目的所指的人与主句中的主语不同,或原主语再次被提到,则必须使用目的从句:
Ships carry lifeboats so that the crew can escape if the ship sinks.
大船上带有救生艇,万一船下沉船员可以逃生。
This knife has a cork handle so that it will float if it falls overboard.
这把刀的柄是用软木做的,万一从船上掉下去,它可以浮在水面上。
A 目的从句常由so that+will/would或can/could+动词原形结构来表示。
这里can/could意为will/would be able to:
They make£10 notes a different size from£5 notes so that blind people can(=will be able to)tell the difference between them.
他们把十英镑的纸币和五英镑的纸币做成不同大小,以便使盲人可以区分开来。
They wrote the notices in several languages so that foreign tourists could (=would be able to)understand them.
他们把通知用几国文字写出来,以便让各国游客都能看得懂。
如句子的主要动词是一般现在时、一般完成时或一般将来时,则都可用can和will。如主要动词是一般过去时,则使用could和would。请看上面和下面这些例句:
I light/am lighting/have lit/will light the fire so that the house will be warm when they return.
【牛津实用英语语法:336 目的从句】相关文章:
★ 牛津实用英语语法:347 so和not可替代that从句
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2016-02-29
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