1、原因狀語從句,Adverbial Clauses of Cause,一、because, since和as引導(dǎo)的原因狀語從句,because，since，as這三個詞都可引導(dǎo)原因狀語從句。,Because表示直接的原因或理由，著重點在從句，用于回答why，語氣最強，常譯為“因為”。,Since一般表示對方已知的、無須加以說明的既成事實的理由，全句中心在主句，語氣比because弱，常譯為“既然”。,As表示十分明顯的原因，一般說明因果關(guān)系，著重點在主句，語氣較弱，常譯為“由于”。,Difference,1.The doctor told the patient to go on a diet

2、he was overweight. A. on the condition of B. because C. for D. when,2. the weather was fine, I opened all the windows. A. As B. Because of C. For D. With,3. you are leaving tomorrow, we can eat dinner together tonight. A. For B. Since C. Before D. While,A,B,B,在強調(diào)句式中，若強調(diào)原因壯語從句，只能用because引導(dǎo)的從句。,Exampl

3、e:,It was because he was ill that he didnt go with us.,正因為他病了，他才沒和我們一起去。,二、for 和 because，as，since的區(qū)別,4.The fuel must have been finished, the engine stopped. A. since B. as C. because D. for,because，as，since總是表示因果關(guān)系，而且語氣較強；而for引導(dǎo)的是并列分句，它只是對前面的分句加以解釋，說明推斷的理由，并且只能后置。,We did not go out because it was ra

4、ining. （因為下雨，我們沒有出去。）,It must have rained last night, for the ground is wet this morning. （昨晚一定下雨了，因為今天早上地都是濕的。）,D,三、短語連接詞引導(dǎo)的原因狀語從句,5. that my head had cleared, my brain was also beginning to work much better. A. For B. Now C. Since D. Despite,I havent finished writing the report yet, Im lazy, I hav

5、e no time.,我還沒有寫完報告，不是因為我懶，而是因為沒有時間。,Translate a sentence:,B,not that,but that,四、某些介詞詞組引導(dǎo)的原因狀語從句,6. He was not severely punished for his crime that he was young. A. on the ground B. in the case of C. in view of D. on condition,by reason,for fear,for the reason,on the ground,A,. because，since，as這三個詞都可引導(dǎo)原因狀語從句。其中because語氣較強，主要用以回答由why引出的問句，since次之，as最弱。since和as表示的原因多是既成事實。若從句表示的原因還不是確定的事實，就不能用since。,Summary:,. 在原因狀語從句中，for引導(dǎo)的從句并