本文目录
状语从句是英语语法中的重要组成部分，它可以修饰主句，表示时间、原因、条件、目的等等。而引导状语从句的词语也是非常关键的。下面我们来介绍几个常用的状语从句引导词。
1. 因果关系
表示因果关系的引导词有“because”和“since”，它们的意思都是“因为”。比如：
- I couldn't go to the party because I had to work.
- Since it's raining outside, we should stay indoors.
2. 条件关系
表示条件关系的引导词有“if”和“unless”，前者表示“如果”，后者表示“除非”。比如：
- If you study hard, you'll pass the exam.
- Unless you hurry, we'll be late for the movie.
3. 时间关系
表示时间关系的引导词有“when”、“while”、“as”和“before”等等。比如：
- When I was young, I used to play soccer every day.
- While I was reading, I heard a loud noise outside.
- As soon as the movie starts, please turn off your phone.
- Before you leave, please lock the door.
4. 目的关系
表示目的关系的引导词有“so that”和“in order to”，意思都是“为了”。比如：
- I'm studying hard so that I can get into a good college.
- We need to save money in order to buy a new car.
以上就是一些常用的状语从句引导词，希望能对大家的英语学习有所帮助。
