在上海高考中，状语从句的讲解通常包括以下几个方面：

时间状语从句

连接词：when, while, as, whenever

例句：

When we were working in the field, it began to rain.

I was about to go out when the telephone rang.

地点状语从句

连接词：where, wherever

例句：

Go wherever you want.

原因状语从句

连接词：because, since, as

例句：

I didn't see Peter on the way, but I took some relaxation time for us all the vacation.

目的状语从句

连接词：so that, in order that

例句：

We got up early so that we could catch the train.

结果状语从句

连接词：so that, so that

例句：

It was raining so that we decided to stay at home.

方式状语从句

连接词：as, in the way that

例句：

She sings as beautifully as her sister.

比较状语从句

连接词：than

例句：

This book is more interesting than that one.

条件状语从句

连接词：if, unless

例句：

If it rains, we will stay at home.

让步状语从句

连接词：although, though, even though, if, unless

例句：

Even though it was cold, we decided to go hiking.

时间状语

连接词：the first time, by the time, each time, next time

例句：

The first time I came to Beijing, I liked the city very much.

在高考中，状语从句的讲解通常结合具体的例句和练习题，帮助学生理解和掌握各种状语从句的用法和意义。建议学生在学习过程中多做练习题，巩固所学知识。