一篇文章带你认清初中英语最常考的三大状语从句
日期：2023-07-18 13:01 点击：
状语从句指在句子中用作状语的从句。根据其作用可分为时间、地点、原因、条件、目的、结果、让步、方式和比较等九种状语从句。
初中阶段，我们学习的状语从句主要有时间状语从句、条件状语从句和原因状语从句，今天我们就来复习一下这三种状语从句。
主要连词：when、while、as、as soon as（一......就......）、before、after、since等。
【注意1】时间状语从句要符合“主将从现”的原则：即主句用一般将来时，从句用一般现在时。例如：
I will call you as soon as I arrive in Beijing.
I will give you a call when I arrive at London.
【注意2】since 的用法：since引导的时间状语从句必须是一般过去时，其主句必须时现在完成时。例如：
Since I came to Beijing, I have lived here.
【注意3】while 引导的时间状语从句中，谓语动词必须时持续的; when 引导的时间状语从句中，谓语动词可以持续也可以不持续。例如：
While I was away last summer, my dog was taken good care of.
When I lived in that small village，I often went to play in the field.
When the film ended，all the people began to go out of the cinema.
主要连词：if, unless（除非=if...not...）, as long as（只要）等。
【注意】条件状语从句要符合“主将从现”的原则：即主句用一般将来时，从句用一般现在时。例如：
If it is fine tomorrow，we will have a picnic outdoors.
Unless you work hard, you won't succeed.（=If you don't work hard, you won't succeed.）
As long as you go, I will go.
主要连词：because, as（由于）, since（因为，既然）等。
【注意】because 引导的原因是未知的原因，as和since引导的原因是已知的原因。例如：
I didn't go to school because I was ill.
As it is raining heavily, we won't go to the park.
Since everyone is here, let's begin our meeting.
