if条件状语从句和宾语从句.ppt

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,Revision,A,dverbial,C,lause of,C,ondition,if,引导的条件状语从句,&,宾语从句,-,复习课,1,She is doing her homework.,If you,are,hard-working,you,will,get good grades.,She gets good grades.,2,If you,play,computer games on weekdays,you,ll,be very tired in class,your parents,will,be sad.,you,wont,get good grades,.,your eyes,will,be poor,3,1),条件状语从句通常由,if,或,unless(=if not),引导，从句中常用,一般时代替将来时,，即,if,或,unless,后的句子谓语用一般现在时。但是，主句则通常用将来时，情态动词或祈使句。,时态主将从现,主句一般将来时，,从句一般现在时,4,1.,如果主句是一般将来时，从句则用一般现在时。,If it rains,（从句），,I will stay at home.,Ill go with you if you dont want to go alone,（从句）,.,2.,如果主句含有,must,may,can,等情态动词，从句也要用,一般现在时。,If you drive too fast,you may have an accident.,You must stop if the traffic light is red.,3.,如果主句是祈使句，从句同样要用一般现在时。,Dont go and play football if you dont finish your,homework.,Please call me if he comes next Sunday.,if,条件状语从句结构及时态,Revision,5,If,引导条状语从句时，从句中用一般现在时代替一般将来时。,1.If he _(go)to the movies,he wont finish his work.,goes,2.If I _(become)a doctor,I can help others.,become,3.If we _(have)time,we will go to the park tomorrow.,have,4.,如果你去，我也去。,If you go,I will go.,5.,如果明天下雨，请带雨衣,。,raincoat,Please take a raincoat if it rains.,excellent,6,If you are free this weekend,what will you do?,If I am free,sleep,watch TV,play computer games,practice,7,If you want to get good marks,do what?Dont do what?,If you want to get good marks,_.,If you want to get good marks,dont _.,study hard,listen to teachers carefully.,do homework by yourself.,copy your homework.,talk in the class,cheat in the exams,8,If,条件句的替代形式：,（,1,）,祈使句,+and/or+,陈述句,（谓语动词通常用将来时态）。其中，,and,表示句意顺承；,or,表示转折，意为“否则”。,e.g.If you work hard,youll pass the exam easily.,=Work hard,and youll pass the exam easily.,If you dont work hard,youll fall behind others.,=Work hard,or youll fall behind others.,very good,9,（,2,）用介词,with,without,的替代形式：,e.g.If there is no water,the fish may die.,=Fish may die,without,water.,If you help me,Ill finish my task on time.,=,With,your help,Ill finish my task on time.,10,if,引导的条件状语从句和,if,引导的宾语从句的区分,:,If,在宾语从句中翻译为,“是否”,If,在条件状语从句中翻译为,“如果”,Ill go to see you if I am free next week.,I want to know if he is a teacher.,whether,1.if,在句中的含义不同,11,2.if,在从句中的位置不同,If,引导的宾语从句放在主句之后；而,if,引导的状语从句可放在主句之前也可放在主句之后,=,If it doesnt rain,I will go out tomorrow.,I will go out tomorrow if it doesnt rain.,I dont know if the train has arrived.,If,引导的条件状语从句放于句首时多用逗号隔开；而,if,引导的宾语从句则不能。,12,3.,时态要求上有区别,If,引导条件状语从句的时态为一般现在时 记住,“,主将从现”,1.I want to know if there,a sports meeting next month.,doesnt rain,will be,2.If it,doesnt rain,well go out,If,引导的宾语从句的时态由主句及本身时态决定；,13,找出下列句子中哪些是,if,条件状语从句，哪些是,if,宾语从句,1.Can you tell me if she can come to the meeting?,2.She will not go there if it is rainy tomorrow.,3.I cant guess if she will be angry.,4.If we help each other,we will get good results.,14,If,引导的条件状语从句或宾语从句的练习,1,If I _(not understand,）,I will ask my teacher for help.,If I _(copy)your homework,I will cheat myself.,I dont know if it _,(rain)tomorrow.,My teacher asked me if I _ (finish)my homework already.,dont understand,copy,will rain,had finished,15,summary,if,的用法,2.,引导条件状语从句：,译为“如果，假如”,(1)if,从句,+,祈使句,(2)if,从句,+,主句（一般将来时）,(3)if,从句,+,主句（含有情态动词）,1.,引导宾语从句,：译为“是否”，表示不确定的概念。时态特征为：宾语从句的时态一致性（主过从过，主现从自由）,I didnt know if your father could come together.,Can you tell me if miss your parents?,16,