2.原因状语从句
原因状语从句表示主句中动作或状态发生的原因或理由, 可位于主句之前,之后或插在主句中间。主句表示结果, 从句表示原因, 主要由because, as, since, for,
seeing ( that), considering ( that), now (that), in that, not ... because等引导。
1) because “因为’’as ‘‘,由于” , since “既然” , for “因为”
because 意为“因为” , 表示直接的原因或理由, 着重点在从句, 用于回答why,语气最强。
He is absent today because he is ill.
当主句为否定句时, 从句 because 须用逗号与主句隔开, 否则容易引起歧义。
I didn’ t visit him, because I wanted to borrow some books.
我没去拜访他, 因为我想借几本书。
I didn’ t visit him because I wanted to borrow some books.
我不是因为想借几本书才去拜访他的。
as意为“由于”, 表示十分明显的原因,所引导的从句常位于主句之前, 有时也可位于主句
之后 ,一般说明因果关系, 着重点在主句, 原因或理由只是附带说明, 不用于回答why的问题,常用于口语。
As it is snowing, we shall not go to the park.
As this book is written in simple English, it is suitable for beginners.
since 意为“既然 , 由于”时表示对方已知的、无须加以说明的既成事实的理由, 只是一个附带说明。since = as it is the fact that ... 全句中心在主句。如从句表示的原因不是确定的事实, 就不能用since,通常用because.
Since everybody is here, let’ s begin our discussion.
Since you seem to know them, why don’ t you introduce me to them?
for是一个并列连词, 由for连结的表原因的句子常看作并列句, 它只提供一些补充说明或对
前一个分句加以解释, 不可前置。与because不同的是:because 引导的从句位置可前可后, 而for引导的分句只能后置, 且往往须用逗号或分号与前一个分句分开。
I didn’ t go to see him, for a heavy snow was falling.
The days were short, for it was now December.
有时 , for 引起的从句并不表示原因, 而是表示一种推断或解释,而 because 则不能。
Someone in the house must be ill, for a doctor has just come out.
He couldn’ t have seen me, for I was not there.
一、填入恰当的连词
1.I didn’ t go to school yesterday _________ I was ill.
2.________ everybody is here, let’ s begin our meeting.
3.________ you are in poor health, you should not stay up late.
4.I asked her to stay to tea, ________ I had something to tell her.
5.________ all the passengers are here, why don’ t we start at once?
6.Bill won’ t make any progress ________ he doesn’ t study harder than before.
7. He might have gone to bed, ________ the light went out.
1.because
2.Since
3.As
4.because
5.Since
6.because
7.for
二、填入恰当的连词
1.______ you do not understand, I will explain again.
2.______ Jane was the oldest in this family, she had to look after the others.
3.He must be ill, ______ he is absent today.
4.The teacher must be strict with you ______they want you to make great progress.
5._____your father is well again, you no longer have anything to worry about.
6.The day breaks, _____the birds are singing.
7.______ you are ill, you’ d better go to see the doctor.
8.______ she was late for class, she had to say sorry.
1.since
2. As
3. for
4. because
5. Since
6. for
7. Since
8. As
2)用下列短语引导 :
seeing (that) “鉴于 , 既然” , considering (that) “考虑到” now (that) “既然” , in that “因为” , not ... because “不是因为” not that ⋯⋯but that “不是因为而是因为 , ’
seeing that 与 considering that 同义 , 含义近似 since,所引导的句子中心在主句 , 重在强调结果。
Seeing that the weather is bad, we Considering that they are newcomers, they ’ ll stay at home.
’ ve accomplished a lot.
now that 的含义与 since(“既然”）接近 , 区别在于 :since 表示原先已存在的情况 , 而 now that 表示由于新情况的出现而促成某事发生。
Now that it has stopped raining, let Now that you are all here, let
’ s start at once. ’s try to reach a decision.
in that 作“因为”解时 , 由于介词 in 的含义是指“在方面” , 有限制作用 , 因此多指由于某一方面
的原因或理由 , 不能位于句首。
I like the city, but I like the country better in that I have more friends in the country.
I could understand his point of view, in that I’ d been in a similar position myself.
not ... because 意为“不是因为”, 该结构中的not 否定 because。
She didn’ t marry you becauseyou had money.
她不是因为你有钱才嫁给你。
The machine didn’ t stop because the fuel was used up.
机器不是因为燃料耗尽才停下来的。
