高三英语语法讲解 专题16 连词.doc

一.概念 连词是用来连接词,短语,从句或句子的词.连词不作成分.二.要点精讲1.表示并列关系的连词有：and, bothand, not only but also和neithernor等1)and：和，并且a：基本用法：“and”表示 “和”、“并且”的意思，用来连接对等关系的字和字，片语和片语，句子和句子。i enjoy basketball , football and table tennis.the weather becomes colder and colder.b:特别用法：祁使句后连接and，有条件句作用，此时and=if you,youll go straight on, and youll see the library.=if you go straight on, you will see the library.2.表示转折关系的连词有：but, however, yet, still，while等。mary was a nice girl, but she had one shortcoming.tom got up early, yet he failed to catch the train.he was very tired, still he kept on walking.your composition is fairly good, however, there is still someroom for improvement.jane is hard working ,while her sister is quite lazy.3.表示选择关系的并列连词有：or, eitheror,whether or等。1)or：或、否则a:基本用法or 表示 “或” 的意思，使用于两者之中选择一个的时候。-is your friend english or american? -american.he doesnt like dumplings or noodles.5.引导时间状语从句的从属连词有：before, after, when, while, as, till, until, since, as soon as等。after they had planted their crops, they took a rest.we have learned six lessons since he began to teach us.as soon as he gets to beijing, hell call me.6. 引导条件状语从句的从属连词有：if(如果), unless(除非，如果不)等。if you dont go soon, youll be late.=unless you go soon, youll be late.7.引导原因状语从句的从属连词有 because, as, since等。because“因为”语气最强,回答why提问时只能用because，其引导的从句可放在句首或句末；as“由于”、since“既然”语气不如because强，引导的从句常置于句首；for是并列连词，语气最弱，对前面分句加以解释或补充说明，其引导的分句常置于句末且用逗号隔开。he didnt go to school because he was ill.as it was raining, we went there by bus.11.引导比较状语从句的从属连词有： asas(与一样),not as/so as(不及，赶不上),和than(比)等。i know you better than she does. he works as carefully as she. i cant run as/so fast as you.12.引导名词性从句的从属连词有：that和 if/whether(是否)等。we know that the earth goes around the sun.(宾语从句)i wonder if he has received my e-mail. (宾语从句) whether hell go there hasnt been decided.(主语从句)注意：在时间状语从句和条件状语从句中，如果主句是将来时，从句要用一般现在时。ill go on with the work when i come back tomorrow.he wont come unless he is invited.三.即学即练10、if tom mike asks for their car, tell him to come tomorrow.aorbandcwithdbut11、it was already ten oclock we got to the museum this morning.athatbwhencifdfor12、its a long time we met last. asobaftercsincedbefore13、that maths problem is difficult nobody can do it.atootobve