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because和for強(qiáng)調(diào)“為什么”，說(shuō)話(huà)人希望大家關(guān)注原因

Because引表示直接原因，for表示間接原因，或者推斷的根據(jù)。

for引導(dǎo)的原因狀語(yǔ)從句一般只能在句中。

如：

Kate spoke quietly because she didn’t want Ali to hear.

Kate 平靜地說(shuō)話(huà)，因?yàn)樗幌胱孉li聽(tīng)到。

I’m sure it rained last night, for the ground is wet.

我確信昨晚下雨了，因?yàn)榈孛媸菨竦摹?/p>

since和as也是“因?yàn)椤?，但只是附帶說(shuō)明原因，說(shuō)話(huà)人希望大家關(guān)注結(jié)果。

二詞差別不大，但since的理由比as更充分一些。

Since everyone is here, let’s start.

既然大家都來(lái)了，我們就開(kāi)始吧。

I really want Ellen to come as I want to hear about her trip to France.

我真的很想讓Ellen 來(lái)，因?yàn)槲蚁肼?tīng)一聽(tīng)她去法國(guó)的旅行。

例句:(注意觀察下面例句中，主從句的先后順序，以及逗號(hào)的使用。)

Because I opened Lisa’s letter, she’s angry with me.

因?yàn)槲掖蜷_(kāi)了麗莎的信，她生我的氣。

Lisa is angry with me because I opened her letter.

麗莎因?yàn)槲掖蜷_(kāi)了她的信而生我的氣。

The days are shorter and shorter, for it’s December.

白天越來(lái)越短了，因?yàn)槭鞘隆?br>

As Mike was in Spain, he decided to watch Flamenco dance.

Mike在西班牙時(shí)，他決定去看弗拉門(mén)戈舞。

Mike decided to watch Flamenco dance as he was in Spain.

Mike決定在西班牙觀看弗拉門(mén)戈舞。

We had a video conference (視頻會(huì)), since half of our colleagues were in the US.

我們有一個(gè)視頻會(huì)議，因?yàn)槲覀円话氲耐露荚诿绹?guó)。

Since half of our colleagues were in the US, we had a video conference.

因?yàn)槲覀円话氲耐露荚诿绹?guó)，所以我們開(kāi)了一個(gè)視頻會(huì)議。