原因狀語從句主要的有because, as, since, seeing (that), now (that), considering (that) 等。如：
1. 由because引導(dǎo)
He couldn’t get to school because he had a cold. 他因患感冒而未能去上學(xué)。
I can’t take the examination because I am ill. 我不能參加考試因?yàn)槲疑×恕?BR> He distrusted me because I was new. 他不信任我是因?yàn)槲沂切聛淼摹?BR> Because I worked fast, I finished early. 因?yàn)槲腋傻每欤晕彝瓿傻迷纭?BR> They can’t have gone out because the light’s on. 他們不可能出去了，因?yàn)闊暨€亮著。
He could not concentrate because the room was noisy. 他不能集中思想，因?yàn)榉坷锾场?BR> I read no further than the caption because the subject of the article seemed uninteresting. 我只看了標(biāo)題，因?yàn)槲恼骂}目似乎不引人興趣。
I could have gone with you because I was there at that time. 我本來可以和你一道去的，因?yàn)槟菚r(shí)我也在那里。
2. 由as引導(dǎo)
As all the seats full I stood up. 因?yàn)樗凶欢加腥耍揖驼玖似饋怼?BR> As it’s raining, we’ll have to stay at home. 因?yàn)樘煜掠?，我們得待在家里?BR> As all the seats were full he stood up. 由于所有座位都有人了，他站了起來。
We didn’t know what to do as we are not his parents. 我們不知怎么辦好，因?yàn)槲覀儾皇撬母改浮?BR> 3. 由since引導(dǎo)
Since everybody is here, let’s begin our discussion. 大家都到了，我們就開始吧。
Since we’ve no money, we can’t buy it. 因?yàn)槲覀儧]有錢，我們沒法買它。
He could not answer the question, since he had not made up his mind. 他不能回答這個(gè)問題，因?yàn)樗€沒拿定注意。
4. 由seeing that引導(dǎo)
Seeing that it is 8 o’clock, we’ll wait no longer. 由于時(shí)間已到8點(diǎn)，我們將不再等了。
Seeing that it’s raining，we’d better stay indoors. 既然外邊在下雨，我們待在室內(nèi)。
Now that you are here, you’d better stay. 你既然來了，還是留下吧(既來之，則安之)。
5. 由now that引導(dǎo)
Now that you are here, you’d better stay. 你既然來了，還是留下吧。
Now that you’re well again. you can travel. 既然你身體好了，你現(xiàn)在可以旅行了。
Now that you mention it, I do remember the incident. 經(jīng)你一提，我想起那事了。
注：其中的 that 通?？梢允÷浴Ｈ纾?BR> Now (that) John’s arrived, we can begin. 既然約翰到了, 我 們可以開始了
1. 由because引導(dǎo)
He couldn’t get to school because he had a cold. 他因患感冒而未能去上學(xué)。
I can’t take the examination because I am ill. 我不能參加考試因?yàn)槲疑×恕?BR> He distrusted me because I was new. 他不信任我是因?yàn)槲沂切聛淼摹?BR> Because I worked fast, I finished early. 因?yàn)槲腋傻每欤晕彝瓿傻迷纭?BR> They can’t have gone out because the light’s on. 他們不可能出去了，因?yàn)闊暨€亮著。
He could not concentrate because the room was noisy. 他不能集中思想，因?yàn)榉坷锾场?BR> I read no further than the caption because the subject of the article seemed uninteresting. 我只看了標(biāo)題，因?yàn)槲恼骂}目似乎不引人興趣。
I could have gone with you because I was there at that time. 我本來可以和你一道去的，因?yàn)槟菚r(shí)我也在那里。
2. 由as引導(dǎo)
As all the seats full I stood up. 因?yàn)樗凶欢加腥耍揖驼玖似饋怼?BR> As it’s raining, we’ll have to stay at home. 因?yàn)樘煜掠?，我們得待在家里?BR> As all the seats were full he stood up. 由于所有座位都有人了，他站了起來。
We didn’t know what to do as we are not his parents. 我們不知怎么辦好，因?yàn)槲覀儾皇撬母改浮?BR> 3. 由since引導(dǎo)
Since everybody is here, let’s begin our discussion. 大家都到了，我們就開始吧。
Since we’ve no money, we can’t buy it. 因?yàn)槲覀儧]有錢，我們沒法買它。
He could not answer the question, since he had not made up his mind. 他不能回答這個(gè)問題，因?yàn)樗€沒拿定注意。
4. 由seeing that引導(dǎo)
Seeing that it is 8 o’clock, we’ll wait no longer. 由于時(shí)間已到8點(diǎn)，我們將不再等了。
Seeing that it’s raining，we’d better stay indoors. 既然外邊在下雨，我們待在室內(nèi)。
Now that you are here, you’d better stay. 你既然來了，還是留下吧(既來之，則安之)。
5. 由now that引導(dǎo)
Now that you are here, you’d better stay. 你既然來了，還是留下吧。
Now that you’re well again. you can travel. 既然你身體好了，你現(xiàn)在可以旅行了。
Now that you mention it, I do remember the incident. 經(jīng)你一提，我想起那事了。
注：其中的 that 通?？梢允÷浴Ｈ纾?BR> Now (that) John’s arrived, we can begin. 既然約翰到了, 我 們可以開始了