高考英语从句的使用主要涉及以下几个方面：

状语从句

时间状语从句：常用"when", "while", "as", "before", "after", "since", "until"等引导。例如：

When I arrived at the station, the train had already left.

As soon as it rains, we will stay at home.

地点状语从句：由"where"引导。例如：

Go wherever you want.

原因状语从句：由"because", "since", "as"引导。例如：

I didn't go out because it was raining.

目的状语从句：由"so that", "in order that", "for fear that"等引导。例如：

They studied hard so that they could pass the exam.

结果状语从句：由"so...that"或"such...that"引导。例如：

She was so tired that she fell asleep immediately.

条件状语从句：由"if", "unless", "provided that"等引导。例如：

If it rains, the match will be canceled.

让步状语从句：由"although", "though", "even if"等引导。例如：

Even if it is cold, we will go hiking.

定语从句

定语从句是用来描述或限定名词或代词的从句，通常紧随其先行词之后。关键是要识别关系代词（如that, which, who, whom, whose, as）和关系副词（如when, where, why）。例如：

The book which is on the table is mine.

The person who called you is my friend.

名词性从句

名词性从句在句子中充当名词的成分，包括主语从句、宾语从句、表语从句和同位语从句。引导词有that, if, whether, who, whom, whose, which等。例如：

That he will come is certain.

I don't know if she is coming or not.

建议

理解与区分：仔细理解不同从句的用法和区别，注意连接词的细微差别。

多读多练：通过阅读经典文章、小说或电影对白，实际应用从句，提高语感。

注意时态：确保从句中的时态与主句保持一致，避免语法错误。

通过掌握这些基本知识和技巧，可以更有效地在高考英语中运用从句。