是用來(lái)說(shuō)明引起主句這個(gè)結(jié)果的原因的從句，在初中階段引導(dǎo)原因狀語(yǔ)從句的從屬連詞主要的有because, as, since,for等。例如：
1.I didnt go to school yesterday because I was ill. 我昨天沒去上學(xué)，因?yàn)槲疑×恕?/p>
2. Since everybody is h ere, lets begin our meeting. 既然大家都來(lái)了, 讓我們開始開會(huì)吧.
3. As you are in poor health, you should not stay up late. 既然你身體不好, 你就不該熬夜.
4.I asked her to stay to tea, for I had something to tell her. 我請(qǐng)她留下來(lái)喝茶,因?yàn)槲矣惺乱嬖V她.
原因狀語(yǔ)從句應(yīng)注意的問(wèn)題
1、because , since , as , for,辨析
1)because語(yǔ)勢(shì)最強(qiáng)，用來(lái)說(shuō)明人所不知的原因，回答why提出的問(wèn)題。當(dāng)原因是顯而易見的或已為人們所知，就用as或 since。
I did nt 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(lái)代替。但如果不是說(shuō)明直接原因，而是多種情況加以推斷，就只能用for。例：
He is absent today, becaus e / for he is ill. He must be ill, for he is absent today.
3) as和for的區(qū)別：通常情況下，as引導(dǎo)的從句在主句前，for引導(dǎo)的從句在主句后。例： As the weather is cold, I stay at home.(同義句) I stay at home, for the weather is cold.
2、because習(xí)慣上不與so連用
漢語(yǔ)習(xí)慣上說(shuō)因?yàn)樗�，但英語(yǔ)習(xí)慣上卻不能將 so與because 連用：
正：Because it was raining, we stayed at home. / It was raining, so we stayed at home.
誤：Because it was raining, so we stayed at h ome. 因?yàn)橄掠辏晕覀兇粼诩依铩?/p>
3、because 從句與 because of短語(yǔ)的轉(zhuǎn)換
Because引導(dǎo)的原因狀語(yǔ)從句有時(shí)可與because of 短語(yǔ)轉(zhuǎn)換，because of后加的原因可以為好或壞 ，但最正規(guī)的還是because。
He cant come because he is ill. / He cant come because of his illness. 他因病不能來(lái)。
I said nothing about it because his wife was there. / I said nothing about it because of his wifes being th ere. 因?yàn)樗拮釉谀莾�，我�?duì)此事只字未提。
常見考法
對(duì)于原因狀語(yǔ)從句的考查，多以單選和完形填空的形式，從連詞的意義角度讓大家選擇連詞。
典型例題：He fou nd it increasin gly difficult to read, ____ hi s eyesight was beginning to fail.
A. and B. for C. but D. or
解析： his eyesight was beginning to fail是he found it increasingly difficult to read的原因， 因此本題應(yīng)選用可以表示原因的連詞for引導(dǎo)原因狀語(yǔ)從句。
答案： B
誤區(qū)提醒
除了because , since , as , for這四個(gè)詞的辨析外，對(duì)于because 從句與 because of短語(yǔ)的區(qū)分也是難點(diǎn)之一。Because引導(dǎo)的原因狀語(yǔ)從句有時(shí)可與because of 短語(yǔ)轉(zhuǎn)換，because of后跟的是短 語(yǔ) ，because后跟的是句子。
典型例題：He didnt go to work the heav y rain.
A .because B.because of C.so D.since
解析：題干的意思是 由于那場(chǎng)大雨，他沒有去上班 ，the heavy rain.表示原因，排除C; since 和 because 表示原因，后面跟的是從句，也就是說(shuō)必須是一個(gè)完整的句子，本題中the heavy rain沒有主語(yǔ)和謂語(yǔ)，.只是一個(gè)短語(yǔ)，所以排除A和C;because of表示由于，后跟名詞、代詞或短語(yǔ)。
答案：B
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