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because，as，since，for都可以表示原因，但是其含义和用法不同，请同学们注意它们之间用法上的区别。
because 表示理由或直接原因，意思是“因为”，语气最强。引导原因状语从句时，常用于句子中间，位于句首时，要用逗号隔开。单独成句时，通常用来回答why所提出的问题。例如：
1. I like my parrot because it can sing. 因为鹦鹉会唱歌，所以我喜欢它。
2. Pandas are my favorite animals because they’re very cute.因为熊猫很可爱，所以它们是我最喜爱的动物。
3. —Why do you like giraffes?— Because they are very interesting. “你为什么喜欢长颈鹿？”“因为它们很有趣。”
汉语中，表示因果关系时用关联词“因为……所以……”搭配；而英语中，用because就不用so，用so就不用because。试比较：
Nick caught a bad cold yesterday, so he had to stay at home.
Because Nick caught a bad cold yesterday, he had to stay at home.
尼克昨天得了重感冒，因此他不得不呆在家里。
because 可以与of连用，构成介词短语 because of，后跟名词、代词或短语表示理由、原因。例如：
He has poor eyesight because of doing lots of computer work.由于做大量的电脑工作，他的视力差。
The match was put off because of the bad weather. 比赛由于天气不好被推迟了。
since 表达明显的或已知的理由，意思是“既然”。since 引导的从句常用于句首，语气不如because强，但是比as语气强。引导的从句位于句子末尾时，可以作为补充说明。例如：
1. Since everybody is here, let’s begin. 既然大家都到了，那我们就开始吧。
2. Since you don’t want to go there, I won’t force you to. 既然你不想去，我也不勉强你。
3. I’ll go to ask someone else, since you have no time. 既然你没有时间，我就去找别人。
as 表示理由时，意思是“由于”，引导原因状语从句时，主、从句并重，主句说明原因，从句说明结果，相当于since，但是语气不如since。例如：
1. As it was late, I left in a hurry. 因为天色已晚，我就匆忙离开了。
2. As I’m very busy, I can’t go with you. 我很忙，所以我不能和你一起去。
for是并列连词，表明附加或推断的理由，常用于口语中，意思是“因为”。for连接的句子一般不用于句首，并列句之间可以用逗号分开。例如：
1. I must be away for a week, for I’ll go to Shanghai. 我要离开一个星期，因为我要去上海。
2. He must be at home, for the light in the room is on. 他一定在家，因为房间里的灯亮着。
3. I’m late for class for I got up late. 我上学迟到是因为我起床迟了。
巩固练习：
一、选择适当的词或词组填空（可以重复使用）：
becausesinceasbecause offor
1. He can’t read the English text _______ it is too difficult.
2. _______ you are busy, I shall do the job myself.
3._______ the weather is cold and wet, you’d better put on your coat.
4. My friends are all interested in the concert _______ the singer star.
5. It is morning, _______ the birds are singing.
二、根据汉语提示，完成句子：
1. He didn’t come ______________（因为他病了）.
2. _____________________（因为你得了重感冒），you must stay in bed and drink much hot water.
3. _____________________（因为雨下得很大），we had to stay at home.
4. I was very nervous _____________________（因为昨天的考试）.
5. It must have rained in the night ,______________ （因为我看见地面潮湿了）.
Keys:
一、1. because2. Since / As3. Since / As4. because of5. for
二、1. because he was ill2. Since/ As you have a bad cold3. As / Since it was raining hard4. because of the exam yesterday5. for I saw the ground wet
because 表示理由或直接原因，意思是“因为”，语气最强。引导原因状语从句时，常用于句子中间，位于句首时，要用逗号隔开。单独成句时，通常用来回答why所提出的问题。例如：
1. I like my parrot because it can sing. 因为鹦鹉会唱歌，所以我喜欢它。
2. Pandas are my favorite animals because they’re very cute.因为熊猫很可爱，所以它们是我最喜爱的动物。
3. —Why do you like giraffes?— Because they are very interesting. “你为什么喜欢长颈鹿？”“因为它们很有趣。”
汉语中，表示因果关系时用关联词“因为……所以……”搭配；而英语中，用because就不用so，用so就不用because。试比较：
Nick caught a bad cold yesterday, so he had to stay at home.
Because Nick caught a bad cold yesterday, he had to stay at home.
尼克昨天得了重感冒，因此他不得不呆在家里。
because 可以与of连用，构成介词短语 because of，后跟名词、代词或短语表示理由、原因。例如：
He has poor eyesight because of doing lots of computer work.由于做大量的电脑工作，他的视力差。
The match was put off because of the bad weather. 比赛由于天气不好被推迟了。
since 表达明显的或已知的理由，意思是“既然”。since 引导的从句常用于句首，语气不如because强，但是比as语气强。引导的从句位于句子末尾时，可以作为补充说明。例如：
1. Since everybody is here, let’s begin. 既然大家都到了，那我们就开始吧。
2. Since you don’t want to go there, I won’t force you to. 既然你不想去，我也不勉强你。
3. I’ll go to ask someone else, since you have no time. 既然你没有时间，我就去找别人。
as 表示理由时，意思是“由于”，引导原因状语从句时，主、从句并重，主句说明原因，从句说明结果，相当于since，但是语气不如since。例如：
1. As it was late, I left in a hurry. 因为天色已晚，我就匆忙离开了。
2. As I’m very busy, I can’t go with you. 我很忙，所以我不能和你一起去。
for是并列连词，表明附加或推断的理由，常用于口语中，意思是“因为”。for连接的句子一般不用于句首，并列句之间可以用逗号分开。例如：
1. I must be away for a week, for I’ll go to Shanghai. 我要离开一个星期，因为我要去上海。
2. He must be at home, for the light in the room is on. 他一定在家，因为房间里的灯亮着。
3. I’m late for class for I got up late. 我上学迟到是因为我起床迟了。
巩固练习：
一、选择适当的词或词组填空（可以重复使用）：
becausesinceasbecause offor
1. He can’t read the English text _______ it is too difficult.
2. _______ you are busy, I shall do the job myself.
3._______ the weather is cold and wet, you’d better put on your coat.
4. My friends are all interested in the concert _______ the singer star.
5. It is morning, _______ the birds are singing.
二、根据汉语提示，完成句子：
1. He didn’t come ______________（因为他病了）.
2. _____________________（因为你得了重感冒），you must stay in bed and drink much hot water.
3. _____________________（因为雨下得很大），we had to stay at home.
4. I was very nervous _____________________（因为昨天的考试）.
5. It must have rained in the night ,______________ （因为我看见地面潮湿了）.
Keys:
一、1. because2. Since / As3. Since / As4. because of5. for
二、1. because he was ill2. Since/ As you have a bad cold3. As / Since it was raining hard4. because of the exam yesterday5. for I saw the ground wet