三: 原因状语表达法：
原因状语从句通常由下列单词引导：Because（因为）, as（由于）, for （由于）, since（既然，由于）…等。
例如：
He can't deliver his lectures today because he has got a bad cold .
他今天不能去讲课了，因为他患了重感冒。
I may not be able to attend your wedding party not because I'm not willing to but because I've been caught by something recently.
我或许无法参加你的婚礼了，不是我不想去而是近来有些事情缠着我无法脱身。
I won't dwelt too much time on this matter as it is known to everybody.
由于大家都知道这件事，我就不在这件事上多花时间了。
Since you are busy enough we won't trouble you any more .
既然你们忙得够呛，我们就不再麻烦你们了。
Because it is raining heavily, we have to change our plan to go outing.现在下着这么大的雨，我们不得不改变去郊游的计划。
As the weather was fine, we decided to climb up the mountain.
由于天气晴朗，我们决定去登山。
She is loved by all for she is kind and pretty .
由于她长得漂亮、人又好而深受大家喜欢。
2）关于since和now that
这两个词在表示原因的时候是近义词，都有表示"既然"的意思。但其不同之处在于：now that只能以"新发生的情况"作为某事发生的原因；而在表示"既然"意思的时候就没有这种限制。例如：
Now that the rain is going to stop, we'd better get ready for the afternoon's match .
（此句中，Now that引出的从句显然是表示"新出现的情况"，在句子中作"主句动作发生的原因。也就是说，只有在这种情况下才可以用Now that引导从句，是表示"既然"的意思。）既然雨要停了，我们最好为下午的比赛作好准备。
Since you're so interested in English, why not have a try in the English Speech Contest ?
既然你对英语这么有兴趣，为什么不试一试参加英语演讲比赛？
原因状语从句通常用because , as和since, for 来引导。
例如：
Because the computer is widely used, people get the information of what they need conveniently on the Internet.
因为电脑已经被广泛使用，人们可以很方便的在互联网上得到他们需要的信息。
It is winter because there are much snow covered the top of the mountain.是冬天了，因为山头上有许多雪。
The teacher was angry not because we were late but because we made an excuse for being late .
他很生气不是因为我们来迟了，而是因为我们为迟到编了个借口。
As it was raining hard , we had to put off our sports meeting . 由于雨太大，我们推迟运动会。
I went to bed early, as I was too tied. 我睡得早，因为我太累了。
Since you feel ill , you’d better have a good rest at home . 既然你感觉不舒服，你最好在家好好休息。
Since we are here, we may as well stay and make the best of it. 既来之，则安之.
The new arrival student was absent from school today, for he had been in bed with flu for two days. 这位新来的学生今天没上学，因为他患感冒躺在床上两天了。
Jack is poor at study, for his favorite subject is not on his curriculum. 杰克学习不好，因为他最喜欢的课程不再课表上。
但：
注意哦：*1.because （因为） 和so （所以） 不能一起使用。
例如：
Life is like a box of chocolates because you never know what you are going to get. √
生活就像一盒巧克力，因为你不知道你将会吃到什么（味道的巧克力）。
或：You never know what you are going to so life is a box of chocolates. √
Because you never know what you are going to get, so life is like a box of chocolates.×
改为：
The vicar woke up with a start at night by noise outside, so he got up to see what was going on . √
教区牧师夜间被一阵噪音惊醒，因此他起床去看看发生了什么事情。
Because the vicar woke up with a start by noise outside, he got up to see what was going on . √
Because the vicar woke up with a start by noise outside, so he got up to see what was going on . ×
2. * because 和because of虽然都表示“因为”关系，但是because连接一个句子；而because of 连接一个单词或短语； 两者在一定情况下可以相互转换。
例如：
Sue decided to pet the dog because she thought it wouldn’t bite her. 苏决定摸摸这条狗因为她认为它不会咬她。
The vice president had to put off the meeting because of the typhoon khanun. 副总裁不得不因为台风卡努而推迟会议。
He has made rapid progress in English because he works really hard at his study. 因为他真的很用功学习，所以很快他英语就取得了进步。
该句可以用”because of” 表达为：
He has made rapid progress in English because of his hard-working at his study .
3.** because 和as ，since，for之间有一定的区别，即：
1) 在回答问题的时候（通常是回答“why” 引导的问句），通常使用because，而不用as, since,和for,
---Why was the girl in red crying in the street ?
---Because she lost her way home. Let’s come to help.
---为什么穿红色衣服的女孩在街上哭？
---因为她找不到回家的路了。我们去帮帮她吧。
2) because 语势最重，而且通常说明的原因是别人所不知道的，as 和since则通常表示的原因是显而易见的或别人已经知道的。
Tim always has a headache because he likes watching TV for a long time. 蒂姆经常头痛因为他喜欢长时间的看电视。
As he was really hungry, he took out the only one apple and took a large bite, without peeling the skin of it.
因为太饿了，他拿出最后一个苹果，没有削皮就咬了一大口。
Since you are so cold, why not come in and get warm. 既然你那么冷，为什么不进来取暖呢？
3）for 引导的时间状语通常必须放在主句之后，并用逗号与主句隔开；若该从句不是说明直接原因，而是对多种情况加以推断，就只能用for。
He committed a crime and was put into prison, for he robbed a bank a year ago. 他因一年前抢银行而犯罪被送往监狱。
Mum must be at home now, for the light is still on. 妈妈现在肯定在家，因为灯还亮着。
4） 若because引导的原因状语从句在句末，并且前面有逗 号，则可以用for来代替。
I didn’t catch your idea, because / for you had a low voice. 我没有明白你的意思，因为你的声音太小。
She cried with joy, because / for everyone here cares her so much. 她高兴得哭了，因为这里的每一个人都那么的关心她。
4．*** now that （既然，由于）也可以引导原因状语从句.
例如：
Now that you are grown up, you should learn to be responsible for your own action.
既然你长大了, 就应该学着对自己的行为负责了。
Now that he is much better, he can go on with his English study.
既然他好多了, 就可以继续学习英语。
Exercise:
*I. Put the words in each sentence into the right order. 把下列句子中的单词按正确的顺序排列。
1)He see his doctor went to he had some problems because with his stomach.
2) he as didn’t know it before you not should blame on him too much.
3) you come for help since I a piece of advice will give you.
Suggested Keys:
1) He went to see his doctor because he had some problems with his stomach.
2) As he didn’t know it before, you should not blame on him too much.
3) Since you come for help, I will give you a piece of advice.
**II．Extend the following sentences with the word “because / as / since …” 用“because / as / since…”扩写下列句子。
1) I ask you to hurry because…
2) Since… you should work harder.
3) As … I can hardly recognize (辨认出) you.
Suggested Keys:
Any reasonable answer is accepted.
***III. Translate the sentences below. 翻译下列句子：
1) 他没来上学因为他头痛。
2) 由于风太大，你最好带上围巾。
3) 既然你卧病在床，你就让别人代你来开会吧。
Suggested Keys:
1）He didn’t come to school because he had something wrong with his head / because he had a headache.
2) As the wind is fierce, you’d better take a scarf with you.
3) Since you lie in bed, you ask somebody else to attend the meeting instead of you.
原因状语从句通常由下列单词引导：Because（因为）, as（由于）, for （由于）, since（既然，由于）…等。
例如：
He can't deliver his lectures today because he has got a bad cold .
他今天不能去讲课了，因为他患了重感冒。
I may not be able to attend your wedding party not because I'm not willing to but because I've been caught by something recently.
我或许无法参加你的婚礼了，不是我不想去而是近来有些事情缠着我无法脱身。
I won't dwelt too much time on this matter as it is known to everybody.
由于大家都知道这件事，我就不在这件事上多花时间了。
Since you are busy enough we won't trouble you any more .
既然你们忙得够呛，我们就不再麻烦你们了。
Because it is raining heavily, we have to change our plan to go outing.现在下着这么大的雨，我们不得不改变去郊游的计划。
As the weather was fine, we decided to climb up the mountain.
由于天气晴朗，我们决定去登山。
She is loved by all for she is kind and pretty .
由于她长得漂亮、人又好而深受大家喜欢。
2）关于since和now that
这两个词在表示原因的时候是近义词，都有表示"既然"的意思。但其不同之处在于：now that只能以"新发生的情况"作为某事发生的原因；而在表示"既然"意思的时候就没有这种限制。例如：
Now that the rain is going to stop, we'd better get ready for the afternoon's match .
（此句中，Now that引出的从句显然是表示"新出现的情况"，在句子中作"主句动作发生的原因。也就是说，只有在这种情况下才可以用Now that引导从句，是表示"既然"的意思。）既然雨要停了，我们最好为下午的比赛作好准备。
Since you're so interested in English, why not have a try in the English Speech Contest ?
既然你对英语这么有兴趣，为什么不试一试参加英语演讲比赛？
原因状语从句通常用because , as和since, for 来引导。
例如：
Because the computer is widely used, people get the information of what they need conveniently on the Internet.
因为电脑已经被广泛使用，人们可以很方便的在互联网上得到他们需要的信息。
It is winter because there are much snow covered the top of the mountain.是冬天了，因为山头上有许多雪。
The teacher was angry not because we were late but because we made an excuse for being late .
他很生气不是因为我们来迟了，而是因为我们为迟到编了个借口。
As it was raining hard , we had to put off our sports meeting . 由于雨太大，我们推迟运动会。
I went to bed early, as I was too tied. 我睡得早，因为我太累了。
Since you feel ill , you’d better have a good rest at home . 既然你感觉不舒服，你最好在家好好休息。
Since we are here, we may as well stay and make the best of it. 既来之，则安之.
The new arrival student was absent from school today, for he had been in bed with flu for two days. 这位新来的学生今天没上学，因为他患感冒躺在床上两天了。
Jack is poor at study, for his favorite subject is not on his curriculum. 杰克学习不好，因为他最喜欢的课程不再课表上。
但：
注意哦：*1.because （因为） 和so （所以） 不能一起使用。
例如：
Life is like a box of chocolates because you never know what you are going to get. √
生活就像一盒巧克力，因为你不知道你将会吃到什么（味道的巧克力）。
或：You never know what you are going to so life is a box of chocolates. √
Because you never know what you are going to get, so life is like a box of chocolates.×
改为：
The vicar woke up with a start at night by noise outside, so he got up to see what was going on . √
教区牧师夜间被一阵噪音惊醒，因此他起床去看看发生了什么事情。
Because the vicar woke up with a start by noise outside, he got up to see what was going on . √
Because the vicar woke up with a start by noise outside, so he got up to see what was going on . ×
2. * because 和because of虽然都表示“因为”关系，但是because连接一个句子；而because of 连接一个单词或短语； 两者在一定情况下可以相互转换。
例如：
Sue decided to pet the dog because she thought it wouldn’t bite her. 苏决定摸摸这条狗因为她认为它不会咬她。
The vice president had to put off the meeting because of the typhoon khanun. 副总裁不得不因为台风卡努而推迟会议。
He has made rapid progress in English because he works really hard at his study. 因为他真的很用功学习，所以很快他英语就取得了进步。
该句可以用”because of” 表达为：
He has made rapid progress in English because of his hard-working at his study .
3.** because 和as ，since，for之间有一定的区别，即：
1) 在回答问题的时候（通常是回答“why” 引导的问句），通常使用because，而不用as, since,和for,
---Why was the girl in red crying in the street ?
---Because she lost her way home. Let’s come to help.
---为什么穿红色衣服的女孩在街上哭？
---因为她找不到回家的路了。我们去帮帮她吧。
2) because 语势最重，而且通常说明的原因是别人所不知道的，as 和since则通常表示的原因是显而易见的或别人已经知道的。
Tim always has a headache because he likes watching TV for a long time. 蒂姆经常头痛因为他喜欢长时间的看电视。
As he was really hungry, he took out the only one apple and took a large bite, without peeling the skin of it.
因为太饿了，他拿出最后一个苹果，没有削皮就咬了一大口。
Since you are so cold, why not come in and get warm. 既然你那么冷，为什么不进来取暖呢？
3）for 引导的时间状语通常必须放在主句之后，并用逗号与主句隔开；若该从句不是说明直接原因，而是对多种情况加以推断，就只能用for。
He committed a crime and was put into prison, for he robbed a bank a year ago. 他因一年前抢银行而犯罪被送往监狱。
Mum must be at home now, for the light is still on. 妈妈现在肯定在家，因为灯还亮着。
4） 若because引导的原因状语从句在句末，并且前面有逗 号，则可以用for来代替。
I didn’t catch your idea, because / for you had a low voice. 我没有明白你的意思，因为你的声音太小。
She cried with joy, because / for everyone here cares her so much. 她高兴得哭了，因为这里的每一个人都那么的关心她。
4．*** now that （既然，由于）也可以引导原因状语从句.
例如：
Now that you are grown up, you should learn to be responsible for your own action.
既然你长大了, 就应该学着对自己的行为负责了。
Now that he is much better, he can go on with his English study.
既然他好多了, 就可以继续学习英语。
Exercise:
*I. Put the words in each sentence into the right order. 把下列句子中的单词按正确的顺序排列。
1)He see his doctor went to he had some problems because with his stomach.
2) he as didn’t know it before you not should blame on him too much.
3) you come for help since I a piece of advice will give you.
Suggested Keys:
1) He went to see his doctor because he had some problems with his stomach.
2) As he didn’t know it before, you should not blame on him too much.
3) Since you come for help, I will give you a piece of advice.
**II．Extend the following sentences with the word “because / as / since …” 用“because / as / since…”扩写下列句子。
1) I ask you to hurry because…
2) Since… you should work harder.
3) As … I can hardly recognize (辨认出) you.
Suggested Keys:
Any reasonable answer is accepted.
***III. Translate the sentences below. 翻译下列句子：
1) 他没来上学因为他头痛。
2) 由于风太大，你最好带上围巾。
3) 既然你卧病在床，你就让别人代你来开会吧。
Suggested Keys:
1）He didn’t come to school because he had something wrong with his head / because he had a headache.
2) As the wind is fierce, you’d better take a scarf with you.
3) Since you lie in bed, you ask somebody else to attend the meeting instead of you.
