Period 4 Grammar

学习目标 1.复习状语从句的用法

2.状语从句中连词的选用

学习重点：掌握状语从句的用法

学习难点：如何确定状语从句中的连词

课前预习：

Finish activities 1-5 about adverbial clauses on pages 44-45.

使用说明与学法指导：借助预习案中的语法讲解，复习状语从句的用法，完成时间15分钟。

教材助读：

I. 观察教材44页上 Activity 1中的例句，找出连词，并结合已学的状语从句知识完成下列表格。

一、状语从句考查要点简述。状语从句主要用来修饰主句或主句的谓语。一般可分为九大类,分别表示时间、地点、原因、目的、结果、条件、让步、比较和方式。尽管种类较多,但由于状语从句与汉语结构和用法相似,所以理解和掌握它并不难。状语从句的关键是要掌握引导不同状语从句的常用连接词和特殊的连接词即考点。

1、时间状语从句

（1）as、when、while用法一览表。

类别 作 用 例 句 as as 表示"当......的时候"，往往和 when/ while 通用，但它着重强调主句与从句的动作或事情同时或几乎同时发生。 1.She came up as I was cooking.( 同时 )

2.The runners started as the gun went off.( 几乎同时 ) when when (at or during the time that )既可以表示在某一点的时候，又可表示在某一段时间内，主句与从句的动作或事情可以同时发生也可以先后发生。 1.It was raining when we arrived.( 指时间点 )

2.When we were at school, we went to the library every day.( 在一段时间内 ) while while意思是"当......的时候"或"在某一段时间里"。主句中的动作或事情在从句中的动作或事情的进展过程中发生，从句中的动词一般要用延续性动词。在when 表示 a period of time 时，两者可以互换。 1.Please don't talk so loud while others are working.

2.He fell asleep while/ when reading.

3.Strike while the iron is hot.( 用 as 或 when 不可，这里的 while 意思是"趁......" ) 　　

（2）引导时间状语从句的连接词除上述外还有：

①till, not ... until ..., until, before, since

Don't get off the bus until it has stopped.

He waited for his father until(till)it was twelve o'clock.

It will be five years before he returns from England.

②hardly / scarcely ... when, no sooner ... than, as soon as once表示"一......就"

As soon as I have finished it , I'll give yu a call.

Once you show any fear, he will attack you.

We had hardly got / Hardly had we got into the country when itbegan to rain.