一些特殊连词的用法PPT学习教案

1、会计学1一些特殊连词的用法一些特殊连词的用法 由于受母语句子结构与逻辑关系的影响，学生常常把because和so连用、although和but连用。英语中because和so、although和but为什么不能连用？两个分句之间用because连接和用so连接、用although连接和用but连接在句法功能和语义上有什么差别？Unless在句子中该如何使用呢？第1页/共25页 连词中的从属连词包括引导各种状语从句（包括时间、地点、原因、目的、结果、条件、让步状语从句）的引导词（如when, before, until, where, wherever, because, as, since,

2、so that, in order that, so that, if, unless, although等）。第2页/共25页一、Because的用法 例句：Because he stayed up last night, he felt sleepy in class.because 的中文意思是因为，用来连接两个句子，because 既可以放在句首的位置，也可以放在后面。第3页/共25页例：1. I stayed at home yesterday evening because it rained.= Because it rained, I stayed at home yester

3、day evening. 2. Tom went to bed very late last night because he had a lot of homework.= Because he had a lot of homework, Tom went to bed very late last night.第4页/共25页Because句型中的常见错误：1. 因为我没有钱，所以我昨晚就没买那本书了。2. 因为他要看篮球赛，所以我们就和他一起去。上述两句例句，对我们来说，是百分百正确的句子，但在英文来说，却是错误的。 在英语中，若选择用because,就不要用so;反之，若选择用so,

4、就不要用because。第5页/共25页上述句子可以说成：1. Because I had no money, I didnt buy the book last night. 或 I had no money, so I didnt buy the book last night.2. Because he wants to go to the basketball game, we go with him. 或 He wants to go to the basketball game, so we go with him.第6页/共25页2011莆田 Why do you like th

5、is TV program? _ its very interesting and exciting. A. Though B. Because C. So2011宜宾He didnt go to school yesterday _ he was ill. A. because B. because of C. if D. so 第7页/共25页二、If 的用法 if是英语中出现频率很高的连词，并且它的用法也很多。学生感到很难掌握，为了让同学们更多更好地了解其用法及其语法功能。现结合教学中遇到的情况，予以归纳。 第8页/共25页1. if作为连词，引导条件状语从句，它表示的意思是“假如”“如

6、果”等。在复合句中如果主句用将来时，则if引导的状语从句用一般现在时。例如：If it doesnt rain, we will go to the park next Sunday.If you ask him，he will help you第9页/共25页2. if作为连词还可以引导宾语从句。引导宾语从句时和whether意思相同。例如：Lily asked if / whether she liked it. She asked if whether they had a cotton one.第10页/共25页2013 沈阳You can save money_ you buy ch

7、eaper things. A. before B. unless C. if D. until2013大庆Nothing in the world is difficult _ you put your heart into it. A. unless B. though C. because D. if第11页/共25页三、unless的用法 unless是从属连词，引导条件状语从句，含有否定意义，相当于if条件状语从句的否定形式。所以unless = if not。注意：unless引导的条件状语从句和if条件状语从句，与其它时间状语从句一样，用一般现在时代替将来时。 第12页/共25页

8、 连词unless意为“除非如果不”，“除了”，多引导一个否定意义的真实条件句，有时也可引导非真实条件旬。unless引导条件句时，主要用于下列情况。 1. 主句为肯定句。如：You will miss the bus unless you hurry up Youll fail in chemistry again unless you work harder第13页/共25页2. 主句为否定句。如：Unless you oil the motor regularlyit wont run smoothly You will never get anywhere unless you hav

9、e set your goal第14页/共25页3. unless在意义上相当于if.not，因此在有些场合中unless与if.not可互换使用。Unless I am mistaken, Ive seen that man before=lf I am not mistaken, Ive seen that man before第15页/共25页2013 潍坊May I go to Jinbao Park with you next Sunday?No, you cant, _ you have a ticket. I have only one ticket. A. if B. unti

10、l C. unless D. as soon as第16页/共25页四、although与though的区别和用法1. 用作连词表示“虽然”，两者大致同义，可换用，只是 although 比 though 更为正式：Though Although it was raining，we went there. Though Although it was barely four oclock, the lights were already on. 第17页/共25页2. 用作副词although 一般不用作副词，而 though 可用作副词，且一般放在句末(不放在句首)，意为“可是”、“不过”：

11、Its hard work; I enjoy it though. He is looking fit, though. You can count on him, though. 第18页/共25页3. 用于习语在 as though(好像，仿佛)，even though(即使，纵然)等固定短语中不能用 although：She closed her eyes as though she were tired. We felt as though we had witnessed the whole thing. 第19页/共25页根据句子意思，选择although或though填空。1.

12、It was a hard job, he took it _. 2. Look! Some people are running the red lights. We should wait _ others are breaking the rule.althoughthough第20页/共25页2011丽水1. 一I can stay and help you _ you like 一So nice of youBillAuntil B. though Cif Dand2011青岛2. You will achieve nothing _ you work hard.A. if B. unless C. when D. that 第21页/共25页2011广州2. _ they are very tired, they feel happy because theyve finally finished their project. A. So B. Although C. If D. But2013连云港 I wont watch basketball matches _James is playing. He pay