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“because、as、since和for”都是表原因,有什么区别?

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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。

for引导的原因状语从句一般只能在句中。

如:

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。

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。

例句:(注意观察下面例句中,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。

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。

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