定義

常見連接詞

dont give up on something justbecauseyou think you cant do it.

--- chanda kochhar, ceo of icici

cherish your visions and your dreams,asthey are the children of your soul, the blueprints of your ultimate achievements.

--- napolen hill, motivational writer

sincetime is not a person we can overtake when he is gone, let us honor him with mirth and cheerfulness of heart while he is passing.

--- johann wolfgang von goethe, writer

復(fù)合句中，用來表示主句動(dòng)作發(fā)生原因的從句叫做原因狀語從句;他們的位置相對(duì)靈活，可以在句首，句中或句尾。

because 表示直接原因，直接最強(qiáng) (回答why)

why did not he come yesterday?

becausehe was ill. 副詞

he did not come yesterdaybecausehe was ill. 原因狀語從句連詞

因?yàn)樗麄儝甑腻X比我多，所以他們認(rèn)為自己高人一等。

because they make more money than i do,sothey think they are so superior. 本句中so是不應(yīng)該出現(xiàn)的

正確的是

because they make more money than i do, they think they are so superior.

因?yàn)椋涸谟⑽闹校琤ecause 和so不出現(xiàn)在同一句子中。

because it was raining, we stayed at home

= it was raining, so we stayed at home.

because it was raining, so we stayed at home. 這句話是錯(cuò)誤的

since 語氣比because弱一些，引導(dǎo)的原因狀語從句通常表示已知的、顯然的理由;通常在句首。

since/now that you dont love him, you should not marry him.

since / now that you are grown, you should make decisions on your own instead of relying on your parents.

顯然已知的理由，但是沒有because的語氣那么強(qiáng)。

as 附帶說明雙方已知的原因，只是對(duì)主句的附加說明，重點(diǎn)在于主句。

as he is young, he is not qualified to the task.

i shall not be able to begin the work before i return as i am about to start a journey.

for 并列連詞，引導(dǎo)的從句并不說明主句發(fā)生行為的直接原因，只提供補(bǔ)充說明，或表示推斷式解釋，一般不位于主句前，主從句間通常加逗號(hào)。

the day breaks, for the birds are singing.

he went to bed early, because he was tired. 直接的理由

he must be fired, for he went to bed early. 簡(jiǎn)介性的推斷

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