目的状语从句的定义 什么叫目的状语从句? 目的状语从句的定义
目的状语从句是英语语法中的一种从句类型,主要用于说明主句动作发生的目的或意图。下面内容是其核心要点:
一、定义与影响
目的状语从句用来说明主句中谓语动词的目的,即“为了……”“以便……”或“以防……”。它通过特定连词与主句连接,逻辑上强调主句动作的目标或预防性措施。例如:
I study hardso that I can pass the exam.(我努力进修,以便通过考试。)
二、连接词与结构
目的状语从句的引导词多样,常见的有下面内容类型:
- 
核心连词 - so that:最常用,从句中需搭配情态动词(如can/could/may/might)。
 He saved moneyso that he could buy a car. 
- in order that:语气更正式,可置于句首。
 In order that he might succeed, he practiced daily. 
 
- so that:最常用,从句中需搭配情态动词(如can/could/may/might)。
- 
预防性连词 - for fear that /lest:表示“以免”“以防”,从句中多用should。
 She whisperedfor fear that she should wake the baby. 
- in case:强调预防意外情况。
 Take an umbrellain case it rains. 
 
- for fear that /lest:表示“以免”“以防”,从句中多用should。
- 
简化结构 - in order to /so as to:后接动词原形,替换从句。
 He worked hardto pass the exam(= in order to pass). 
 
- in order to /so as to:后接动词原形,替换从句。
三、语法特点
- 
情态动词的运用 
 从句中常包含can, could, may, might, should等情态动词,体现目的的可能性或必要性。We left earlyso that we might catch the train. 
- 
时态一致性 - 主句用现在时,从句用can/may等表将来可能。
- 主句用过去时,从句用could/might/should等表目的。
 
- 
位置灵活性 
 从句可置于主句后(最常见),或通过in order that引导置于句首。
四、注意事项
- 
区分目的状语从句与其他从句 - 与结局状语从句的区别:目的从句含主观意图,结局从句表客观后果。
 He spoke loudlyso that everyone could hear(目的)vs. He spokeso loudly that everyone heard(结局)。 
 
- 与结局状语从句的区别:目的从句含主观意图,结局从句表客观后果。
- 
连词使用限制 - so as to不可用于句首,而in order to可以。
- lest较书面化,口语中多用for fear that或in case。
 
五、经典例句
- so that:
 She set an alarmso that she wouldn’t be late. 
- in case:
 He took notesin case he forgot the details. 
- lest:
 They hid the documentslest they should be discovered. 
目的状语从句通过逻辑连词明确主句动作的意图,需注意情态动词的搭配和连词选择。掌握其用法可提升句子的逻辑性和表达准确性。如需更多练习,可参考相关语法资料。
