英語四級(jí)頻道為備考英語四級(jí)的同學(xué)們整理了2019年12月英語四級(jí)高級(jí)語法講解：狀語從句之原因狀語，希望可以為大家?guī)韼椭A(yù)祝大家高分通過大學(xué)英語四級(jí)考試。
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(shì)，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，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;