32 原因狀語(yǔ)從句　Track 032

引導(dǎo)原因狀語(yǔ)從句最常用的連詞有because，for，as和since。
（1）because
1）語(yǔ)氣最強(qiáng)，只有它才能用來(lái)回答why引導(dǎo)的問(wèn)句。所引出的原因往往是聽(tīng)話人所不知道的或最感興趣的原因。
例句
a. You want to know why I am leaving? I am leaving because I’m fed up with the job and the boss.
你想知道我為什么要辭職？我辭職是因?yàn)槲覅捑肓诉@份工作，受夠了這里的老板。
b. My friends dislike me because I’m handsome and successful.
我的朋友都不喜歡我，因?yàn)槲壹葞洑庥质聵I(yè)有成。
2）可與表示強(qiáng)調(diào)的only，just連用。
例句
a. Just because I don’t complain, people think I’m satisfied.
b. You shouldn’t get angry just because some people speak ill of you.
（2）since
表示人們已知的事實(shí)、不需強(qiáng)調(diào)的原因。所以常譯成“既然……”。since從句通常放在主句之前。
例句
a. Since Monday is Bob’s birthday, let’s throw him a party.
既然周一是鮑勃的生日，那我們?yōu)樗k一場(chǎng)聚會(huì)吧。
b. Since everyone is here, let’s get started.
c. Since you are free tonight, why not drop in and play chess with me?
d. Since we don’t have class tomorrow, why not go out for a picnic?
e. Since you are sleepy, you might as well go to bed.
f.Since you are an English major, I guess you can help me with this sentence .
（3）as
as與since用法差不多，所引出的理由在說(shuō)話人看來(lái)已經(jīng)很明顯，或已為聽(tīng)話人所熟悉，不需用because加以強(qiáng)調(diào)。
例句
a. She didn’t hear us come in as she was asleep.
b. I left a message as you weren’t there.
c. As Monday is a national holiday, all government offices will be closed.
d. I have to speak English with them as the guys I live with don’t know any Chinese.
（4）for
for表示推斷的理由，是對(duì)前面分句的內(nèi)容加以解釋或說(shuō)明。for所引出的分句通常放在主句之后。
例句
a. The days are short, for it is now December.
b. It rained last night, for the ground is wet this morning.
試比較：Because it rained last night, the ground is wet this morning.
c. It must be morning, for the birds are singing.
d. Pay attention to your enemies, for they are the first to discover your mistakes.