1、師說微課堂師說微課堂專題專題: : 狀語從句狀語從句 第十一講第十一講 ： since as because forsince as because for 夯實基礎夯實基礎判斷because he was ill, so he didnt go to school.because與so在一句話中不能同時出現。故so 是多余的。1、 because表示事情發生的直接原因或理由，它的語氣很強。 i missed the train because i got up late. i stayed at home because it rained. 1)回答why的提問,必須用because。 w

2、hy didnt he come yesterday? _ he was ill. abecause bas csince dforbecause 2) 在強調原因狀語從句時，只能用because。 it was because it rained hard that they put off the football match. 3)because 不能與so連用。 4)because+ 從句；because of+ 名詞短語 i came back because it was raining heavily. i came back _ _ the heavy rain.because

3、 ofsince since側重主句，從句表示顯然的或已為人所知的理由，常譯為“因為”“既然”，語氣比because稍弱，通常置于句首。例如： (1)since he asks you, youll tell him why. 他既然問你，那就告訴他為什么吧。 (2)since everyone is here, lets start. 既然大家都到齊了，我們就出發吧。 as常用于表示十分明顯的原因，說明因果關系，重點放在主句上，語氣較弱，常譯成“由于”。如：asas its getting darker, we must go home now. i went to bed early, a

4、s i was exhausted. as it is raining, youd better take a taxi. for是并列連詞(其他為從屬連詞)，它有時可表示因果關系(只能放在主句 之后)，是對前面分句的內容加以解釋。如：forit must have rained last night, for the ground is wet.day breaks, for the bird sings. 1) the ship changed its course because there was a storm. the ship changed its course _ _ the

5、 storm.2) because he was ill, he didnt go to school. he was ill, _ he didnt go to school.3) he couldnt walk because his leg was broken. he couldnt walk _ _ his broken leg.改寫句子 because of so because of注意：for所引導的分句只能放在句子后部或單獨成為一個句子，引導的從句一般不放在句子的開頭。 要點突破要點突破for mike was ill, she didnt come to school. 改

6、錯because知識應用知識應用考題1 _ youve got a chance, you might as well make full use of it. (1999) a. since b. after c. although d. as soon as 答案解析：主句與從句之間存在因果關系， 且“youve got a chance”表示一個顯而易見的原因， 因此應選用表原因的since。 知識用知識用考題2 he found it increasingly difficult to read, _ his eyesight was beginning to fail. (2006北京) a. and b. for c. but d. or 答案解析： “his eyesight was beginning to fail”是“he found it increasingly difficult to read”的原因， 因此本題應選用可以表示原因的連詞for引導原因狀語從句。 becaus