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在英语语法中，状语从句是一种由从属连词引导的从句，它可以用来表示一个动作或情况的目的、原因、条件、时间、方式等。其中，目的状语从句是表示一个动作或情况的目的的从句，而引导目的状语从句的常用连词有以下几个：
1. so that
"So that" 是一个常用的引导目的状语从句的连词，它通常用于表示目的、结果或原因。例如：
- I study hard so that I can get good grades.
- She drank a lot of water so that she wouldn't get dehydrated.
- He ran faster so that he could catch up with the others.
2. in order that
"In order that" 也可以用来引导目的状语从句，它的用法和 so that 非常相似，只是在语气上更加正式。例如：
- We need to finish the project early in order that we can present it to the clients on time.
- He took notes during the lecture in order that he could review them later.
- They arrived at the airport early in order that they wouldn't miss their flight.
3. lest
"Lest" 是一个比较正式的引导目的状语从句的连词，它通常用于表示某种不希望发生的情况。例如：
- She always wears a helmet when riding her bike lest she fall and get hurt.
- He left early lest he be late for the meeting.
- They packed extra food and water lest they get stranded in the wilderness.
4. so as to
"So as to" 是一个比较口语化的引导目的状语从句的连词，它和 so that 的用法非常相似，只是在语气上更加随意。例如：
- He took a break from work so as to clear his mind.
- She saved money so as to buy a new car.
- They practiced every day so as to improve their skills.
以上就是引导目的状语从句的四个常用连词及其用法介绍。希望大家能够掌握并灵活运用它们，提高自己的英语水平。
