1、是是why還是還是because？由一道選擇題想起：由一道選擇題想起：有這樣一道選擇題： Too much time on it. But I still havent worked it out. I suggest you giving it up. It is _ this question is too difficult.A. that B. why C. which D. because四個選項中除that與which明顯不可選外，剩下的why和because卻是讓學生糾結(jié)。這個問題到底怎么解決呢？一、認識why與because之間的關系1. Why是特殊疑問副詞，句中使用這一疑問

2、副詞表示對質(zhì)問為什么會有這一結(jié)果?；卮鹚鼤r必須使用從屬連詞 because，表示對前者質(zhì)問的回應。如： Why are you late for school? Because my bike has broken on the way, Why does the GTP keep falling these years? Because theres something wrong with the governments macro-economic control.2. 表示“的原因是因為”這一意義時，要用that而不是用because來引導表語從句。因為主語the reason why

3、 本身就是原因，再用because則是重復。如： The reason why he cant come is that he is tired. 他不能來的原因是因為他累了。 The reason why people find it so hard to be happy is that they always see the past better than it was. 人們很難開心起來的原因就在于總是把過去看得太過美好。3. 注意漢語中說 “因為 所以”在英語中不能說 “Because so ” 如：因為下雨，所以我們呆在家里。正：Because it was raining, w

4、e stayed at home.正：It was raining, so we stayed at home.誤：Because it was raining, so we stayed at home.4. because是從屬連詞，引導原因狀語從句；而because of 是組合介詞，引導介詞短語作句子的原因狀語。如：He cant come because he is really occupied.= He cant come because of his occupation.（注意這里不能說“ because of he is really occupied”）他來不了了因為他實

5、在是走不開。二、why-clause與because-clause用作表語從句I. That is why 1. 前因后果 即先講述原因，后肯定結(jié)果。 他辛辛苦苦地干了十年。那就是為什么他現(xiàn)在看起來比較蒼老。 He has worked hard for ten years. That is why he looks so old. 吸煙有害于健康， 這就是為什么每年都有幾百萬人死于這種不良習慣的的緣故。Smoking does harm to your health. That is why millions of people die from the habit.由上例句可知，why引導

6、的表語從句通常用于針對前面已經(jīng)說明過的原因進行總結(jié)。2. why引起表語從句時，句子主語可以是代詞，也可以是名詞或what從句。此時，why從句表示該名詞或what從句的具體內(nèi)容。如： One question is why pandas are so difficult to find in thisarea. 一大疑問就是熊貓為什么在該地區(qū)是如此難找到。 What puzzles me is why they didnt show up.令我百思不解的是他們卻為什么沒有出現(xiàn)。 What I want to know is why you helped me so much. 我想知道的是你

7、為什么給我這么多幫助。 II. That is because 前果后因 即先擺出結(jié)果，后再強調(diào)原因。 助手替教授做了發(fā)言, 因為該教授因疾而不能說話。The assistant made the speech in place of the professor. That is because the professor has a disease which prevents him from speaking. 兩座塔樓的樓頂間距比樓底間距要大，是因為地球表面不是平的，而是圓的。The space between the two towers is wider than that at

8、thebottoms. This is because the surface of the earth is not flat but round. 我想跟你談一談。那是因為你誠實幽默。 I like to talk with you. Thats because you are honest andhumorous.三、關于It is why 和It is because 問題1. It is why 其實是不存在的。正確的是: It is the reason why why是關聯(lián)副詞，引導定語從句作reason的定語。 這就是為什么他昨天沒有參加會議的原因。It is the reas

9、on why he didnt take part in the meeting yesterday. 這就是為什么你要在備注欄上提到的原因。It is the reason why you need to mention on the remarkcolumn.2. It is because 屬于強調(diào)句結(jié)構(gòu)的省略形式, 被強調(diào)的是原因狀語從句,而“that +主句” 部分被省略了。如： 之所以沒有人能回答這個問題,是因為它太難了。Nobody can answer the question. It is because this question is too difficult.= It

10、 is because this question is too difficult that nobody can answer the question. 有所不知, 蓋未學也。If there is something we do not know, it is because we havent learnt them. = It is because we havent learnt them that there is something we do not know. 有人會出現(xiàn)在你的夢中，那是因為你想見他（她）。If someone might be in your dream, it is because you wanna see him or her.= It is because you wanna see him or her that someone might be in your dream.通過以上分析可知，why是表示詢問某結(jié)果產(chǎn)生的原因，而 because 是為某結(jié)果提供原因。why引導的從句作表語一般是用在 That / (What ) is why 中; because引導的從句作表語一般是用在That is because