资源简介

(共22张PPT)
Unit 5
Music speaks
语法讲解
译林版九年级英语上册
because/for 引导的原因状语从句
定义
原因状语从句是英语中用于说明主句动作或状态发生原因的从句，修饰主句中的谓语动词，解释“为什么”会发生某事。
1
句式结构
主句 + because + 从句.
Because + 从句, 主句.
表示直接、强烈的因果关系，通常用于回答“why” 引导的疑问句
—Why didn’t you finish the work
你为什么没完成工作？
—Because I ran out of time.
因为我没时间了。
People show thanks to nurses because they take
good care of patients.
人们对护士表示感谢，因为他们把病人照顾得很好。
2
主句, for + 从句.
for，并列连词，不放在句首，只能放在主句之后
前面常有逗号隔开
语气比 because 弱，属于补充说明，不是直接原因
The ground is wet, for it rained last night.
地面是湿的，因为昨晚下过雨。
He must be ill, for he looks pale.
他一定病了，因为他脸色苍白。
I cannot tell you, for it is a secret.
我不能告诉你，因为这是个秘密。
注意
项目 because for
语气 最强，直接原因 较弱，补充说明 / 推测
位置 可句首、可句中 只能主句后
回答 why 可以回答 Why... 不能回答 Why...
标点 一般不用逗号 常用逗号隔开
模拟考场
“The ground is wet, ______ it rained last night.” 空格处应填入：
A. for B. so
C. but D. or
模拟考场
Many students lose marks simply ________ they do not read the questions carefully..
A．although
B．so
C．because
D．before
模拟考场
下列句子中，for引导原因状语从句，且逻辑关系正确的是：
A. For succeeded, he worked hard.
B. For he worked hard, he succeeded.
C. He worked hard, for he succeeded.
D. He succeeded, for he worked hard.
模拟考场
用 for 或 because 填空：
① I didn’t go to the party, ________ I was feeling unwell.
② The ground is wet, _____ it must have rained last night.
because
for
模拟考场
句型转换（合并句子，使用 for）：
She must be hungry. She hasn’t eaten all day.
___________________________________________
She must be hungry, for she hasn’t eaten all day.
since/as引导原因状语从句
句式结构
since + 从句
since，表示已知的、显然的原因，意为“既然”，
常放句首，也可放句中
Since everyone is here, let’s start the discussion.
既然大家都到了，我们开始讨论吧。
Since you have known the truth, I don’t need to hide it.
既然你已经知道真相，我就不用隐瞒了。
as + 从句.
as，表示较客观的原因，语气较弱，常译为“由于”，
引导的从句常置于句首
语气：最弱，几乎只是顺便提一下原因
As it was late, we went home.
由于天色晚了，我们回家了。
As it was raining heavily, we decided to stay at home. 由于雨下得很大，我们决定待在家里。
模拟考场
_______ it is raining, we will stay at home.
A. For
B. As
C. Because of
D. Though
模拟考场
下列句子中，as 引导原因状语从句，且逻辑关系正确的是：
A. As he was late, he missed the bus.
B. As he grew older, he became more wisdom.
C. As she was tired, she went to bed early.
D. As the sun rose, the birds began to sing.
模拟考场
下列句子中，since 引导原因状语从句的是：
A. Since you are not feeling well, you can stay at home.
B. I have been waiting since 9 a.m.
C. Since he moved here, he has made a lot of friends.
D. They have been friends since high school.
模拟考场
用括号中所给词的适当形式填空：
① ______ (Since / As) everyone is here, let's begin our meeting.
② ______ (Since / As) I have a lot of work to do, I must stop writing now.
Since
As
模拟考场
改错题
Since we have no money, so we can’t buy a new car.
_____________________________________________
Since we have no money, we can’t buy a new car.

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