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。
