英语语法中有十二种常见的状语从句类型，包括时间状语从句、原因状语从句、条件状语从句、结果状语从句、让步状语从句、目的状语从句、方式状语从句、比较状语从句、地点状语从句、程度状语从句、假设状语从句和祈使状语从句。每种类型都有特定的从属连词，并通过例句进行了解释。掌握这些状语从句的使用方法可以帮助更好地理解和使用英语语法。
1. 时间状语从句
用于描述主句中动作发生的时间。从属连词：when, while, as, before, after, since, until, as soon as, the moment
- When I arrived at the party, everyone had already left.
- While I was walking to work, I saw an accident.
- After she finished her homework, she watched TV.
2. 原因状语从句
用于描述主句中动作的原因。从属连词：because, since, as, now that
- Because it was raining, we stayed indoors.
- Since you are here, let's start the meeting.
- Now that I have a car, I can travel more easily.
3. 条件状语从句
用于描述主句中动作发生的条件。从属连词：if, unless, provided that, in case
- If I have time, I will visit my friend.
- Unless you finish your work, you can't go out.
- In case it rains, bring an umbrella.
4. 结果状语从句
用于描述主句中动作的结果。从属连词：so that, such that, that
- He studied hard so that he could pass the exam.
- The movie was so boring that I fell asleep.
- She said that she would come to the party.
5. 让步状语从句
用于描述主句中动作的让步。从属连词：although, even though, though, while
- Although it was raining, we still went to the beach.
- Even though he was tired, he continued to work.
- Though he is rich, he is not happy.
6. 目的状语从句
用于描述主句中动作的目的。从属连词：so that, in order that
- I bought a new phone so that I can take better pictures.
- He left early in order that he could catch the train.
7. 方式状语从句
用于描述主句中动作的方式。从属连词：as, as if, like
- He walked as if he was in a hurry.
- She sings like an angel.
- As I told you before, we need to finish the project on time.
8. 比较状语从句
用于描述主句中动作的比较。从属连词：than, as
- He is taller than his brother.
- She can run as fast as a cheetah.
9. 地点状语从句
用于描述主句中动作发生的地点。从属连词：where, wherever
- I will meet you where we agreed.
- Wherever you go, I will follow.
10. 程度状语从句
用于描述主句中动作的程度。从属连词：as, than
- She is not as tall as her sister.
- He works harder than anyone else.
11. 假设状语从句
用于描述主句中动作的假设。从属连词：if, supposing, assuming
- If I were you, I would take the job.
- Supposing he comes late, what should we do?
12. 祈使状语从句
用于表达请求、命令或建议。从属连词：that
- He suggested that we go to the park.
- I requested that he send me the report.
