一些特殊连词的用法.pptx
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,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 yesterday 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,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 this 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 cheaper 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 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 have 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.until 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”：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.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 pays much attention to teamwork.A.unless B.if C.although D.since第22页/共25页 连词是连接词、短语、从句或句子的词。连词是虚词，在句子中不能独立充当成分。同学们在做连词的题目是要通读句子，分析连词在句子中所起的作用，如表示并列、转折、重复、选择、因果等。同时，注意连词引导从句的用法。第23页/共25页 谢谢！第24页/共25页谢谢您的观看！第25页/共25页
