Question

because since as for 的区别

Answer 1

　　because\x0d\x0a　　because引导原因状语从句语气最强，表示直接原因,常用来回答由why提出的问题，所引导从句可放在主句前，也可放在主句后。例如：\x0d\x0a　　"Why did you do it?" "Because Carlos told me to".\x0d\x0a　　We can't go to Julia's party because we're going away that weekend.\x0d\x0a　　Because he didn't catch the last bus, he had to walk home.\x0d\x0a　　Why are you late for school ? Because I missed the first bus.\x0d\x0a　　\x0d\x0a　　as\x0d\x0a　　as “由于,鉴于” 主从并重，从句说明原因，主语说明结果。说明比较明显的原因。多用于日常语中，常译为“由于”，从句一般放于主句前。例如：\x0d\x0a　　You can go first as you're the oldest.\x0d\x0a　　As you don't feel well, you had better stay at home.\x0d\x0a　　As he wasn't ready in time, we went without him.\x0d\x0a　　I must stop writing now, as I have rather a lot of work to do.\x0d\x0a　　As it was getting late, I decided to book into a hotel. As it is raining, you'd better take a taxi.\x0d\x0a　　\x0d\x0a　　since\x0d\x0a　　since “因为,既然” 侧重主句，主句表示显然的或已知的理由。强调说话者和听者双方都知道的原因，常译为“既然”，一般用在这样的句子里。例如：\x0d\x0a　　Since we've got a few minutes to wait for the train, let's have a cup of coffee.\x0d\x0a　　Since you are not feeling well, you may stay at home.\x0d\x0a　　Since everybody is here, let's begin the meeting.\x0d\x0a　　Since I am a boy, let me carry the case.\x0d\x0a　　Since/As you are busy, you had better not go with us.\x0d\x0a　　Since we have no money, we can't buy that vase.\x0d\x0a\x0d\x0a　　for\x0d\x0a　　for “因为,由于”表明附加或推断的理由，引导的分句前常有逗号。for分句不放句首.是用来附带解释或说明前一分句的原因和理由。例如：\x0d\x0a　　Day breaks, for the cock crows.\x0d\x0a　　It must have rained last night, for the ground is wet.\x0d\x0a　　I won't go in, for my father is there.\x0d\x0a　　He must be ill, for he is absent.\x0d\x0a　　I went to see him, for I had something to tell him.

Answer 2

1.主要区别如下。
because 能用在句首，不能居中用逗号， 强调主要原因，理由最充分 。
for 不能用在句首，能居中用逗号， 强调间接原因，理由最不充分 。
since 能用在句首， 能居中用逗号， 强调结果（比as正式），理由第二充分。
as 能用在句首， 不能居中用逗号， 强调结果，理由第三充分。
2.说明
（1）because和for强调“为什么”，说话人希望大家关注原因.
Because引表示直接原因，for表示间接原因，或者推断的根据。
例句:(注意主从句的先后顺序，以及逗号的使用。)
Because I opened Lisa’s letter, she’s angry with me.
因为我打开了丽莎的信，她生我的气。
Lisa is angry with me because I opened her letter.
丽莎因为我打开了她的信而生我的气。
The days are shorter and shorter, for it’s December.
白天越来越短了，因为是十二月。

（2）for引导的原因状语从句一般只能在句中。
例句。
Kate spoke quietly because she didn’t want Ali to hear.
Kate 平静地说话，因为她不想让Ali听到。
I’m sure it rained last night, for the ground is wet.
我确信昨晚下雨了，因为地面是湿的。
（3）since和as也是“因为”，但只是附带说明原因，说话人希望大家关注结果。
二词差别不大，但since的理由比as更充分一些。
Since everyone is here, let’s start.
既然大家都来了，我们就开始吧。
I really want Ellen to come as I want to hear about her trip to France.
我真的很想让Ellen 来，因为我想听一听她去法国的旅行。
As Mike was in Spain, he decided to watch Flamenco dance.
Mike在西班牙时，他决定去看弗拉门戈舞。
Mike decided to watch Flamenco dance as he was in Spain.
Mike决定在西班牙观看弗拉门戈舞。
We had a video conference (视频会), since half of our colleagues were in the US.
我们有一个视频会议，因为我们一半的同事都在美国。
Since half of our colleagues were in the US, we had a video conference.
因为我们一半的同事都在美国，所以我们开了一个视频会议。

Answer 3

because表示直接原因的从句,一般放在主句的后面或前面,在回答why的问句时,必须用because。as说明一般的因果关系,说明比较明显的原因,它引导的从句放在句首,有时也可放在句末。since表示对方已知的无需加以说明的原因或事实。for是并列连词,用来附带解释说明前一分句的原因或理由。