大學英語四級考試涉及的語法知識點多、涉及面寬,對不少考生來說都是一個難題。希望通過本專題的學習,考生能對四級語法有更全面的掌握!

7. 原因狀語從句

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語勢最強,用來說明人所不知的原因,回答why提出的問題。當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,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 :因為,通常只能放在句中,強調(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等短語后面只能接詞或短語,不能接從句。

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