大學(xué)英語(yǔ)四級(jí)考試涉及的語(yǔ)法知識(shí)點(diǎn)多、涉及面寬，對(duì)不少考生來說都是一個(gè)難題。希望通過本專題的學(xué)習(xí)，考生能對(duì)四級(jí)語(yǔ)法有更全面的掌握！

7. 原因狀語(yǔ)從句

連接詞：because，since，as，for，now that，in that，owing to，due to，thanks to，because of，as a result of；

比較：because，since，as和for

1）because語(yǔ)勢(shì)最強(qiáng)，用來說明人所不知的原因，回答why提出的問題。當(dāng)原因是顯而易見的或已為人們所知，就用as或 since。

I didn't go, because I was afraid.

Since /As the weather is so bad, we have to delay our journey.

2）由because引導(dǎo)的從句如果放在句末，且前面有逗號(hào)，則可以用for來代替。但如果不是說明直接原因，而是多種情況加以推斷，就只能用for。

He is absent today, because / for he is ill.

He must be ill, for he is absent today.

now that ：既然；

in that :因?yàn)?，通常只能放在句中，?qiáng)調(diào)重要的，唯一的的原因；

eg：Now that this semester is finished, I am going to rest a few days and take a trip.

Human beings are different from animals in that human can speak and think.

owing to, due to, thanks to, because of , as a result of等短語(yǔ)后面只能接詞或短語(yǔ)，不能接從句。

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