条件状语从句和宾语从句精选课件.ppt

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1、关于条件状语从句和宾语从句第一页，本课件共有16页She is doing her homework.If you If you are are hard-working,hard-working,you you willwill get good grades.get good grades.She gets good grades.第二页，本课件共有16页If you play computer games on weekdays,youll be very tired in classyour parents will be sad.you wont get good grades.yo

2、ur eyes will be poor第三页，本课件共有16页1)条件状语从句通常由if或或unless(=if not)引导，从句中常用一般时代替将来时一般时代替将来时，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。时态主将从现时态主将从现主句一般将来时，主句一般将来时，从句一般现在时从句一般现在时第四页，本课件共有16页1.如果主句是一般将来时，从句则用一般现在时。如果主句是一般将来时，从句则用一般现在时。If it rains（从句），（从句），I will stay at home.Ill go with you if you dont w

3、ant to go alone（从句）（从句）.2.如果主句含有如果主句含有must,may,can 等情态动词，从句也要用等情态动词，从句也要用一般现在时。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。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 co

4、mes next Sunday.if条件状语从句结构及时态条件状语从句结构及时态Revision第五页，本课件共有16页 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.become3.If we _(have)time,we will go to the park tomorrow.have4.如果你去，如果你去，我也去。我也去。If you go,I will go.5.如果明天下雨，

5、请带雨衣如果明天下雨，请带雨衣。raincoatPlease take a raincoat if it rains.第六页，本课件共有16页If you are free this weekend,what will you do?If I am free,sleepwatch TVplay computer gamespractice第七页，本课件共有16页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

6、_.study hard listen to teachers carefully.do homework by yourself.copy your homework.talk in the class cheat in the exams第八页，本课件共有16页If 条件句的替代形式：条件句的替代形式：（1）祈使句祈使句+and/or+陈述句陈述句（谓语动词通常用将来时态）（谓语动词通常用将来时态）。其中，。其中，and表示句意顺承；表示句意顺承；or表示转折，意为表示转折，意为“否则否则”。e.g.If you work hard,youll pass the exam easily.=

7、Work hard,and youll pass the exam easily.If you dont work hard,youll fall behind others.=Work hard,or youll fall behind others.第九页，本课件共有16页（2）用介词）用介词with,without的替代形式：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

8、,Ill finish my task on time.第十页，本课件共有16页if 引导的条件状语从句和引导的条件状语从句和if 引导的宾语从句引导的宾语从句的区分的区分:If 在宾语从句中翻译为在宾语从句中翻译为“是否是否”If 在条件状语从句中翻译为在条件状语从句中翻译为“如果如果”Ill go to see you if I am free next week.I want to know if he is a teacher.whether1.if 在句中的含义不同在句中的含义不同第十一页，本课件共有16页2.if 在从句中的位置不同在从句中的位置不同If 引导的宾语从句放在主句之后

9、；而引导的宾语从句放在主句之后；而if引引导的状语从句可放在主句之前也可放在主导的状语从句可放在主句之前也可放在主句之后句之后=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；引导的条件状语从句放于句首时多用逗号隔开；而而if引导的宾语从句则不能。引导的宾语从句则不能。第十二页，本课件共有16页3.时态要求上有区别时态要求上有区别If 引导条件状语从句的时态为

10、一般现在时引导条件状语从句的时态为一般现在时 记记住住“主将从现主将从现”1.I want to know if there a sports meeting next month.doesnt rainwill be2.If it doesnt rain,well go outIf 引导的宾语从句的时态由主句及本身时态引导的宾语从句的时态由主句及本身时态决定；决定；第十三页，本课件共有16页找出下列句子中哪些是找出下列句子中哪些是if条件状语从句，哪些是条件状语从句，哪些是if宾宾语从句语从句1.Can you tell me if she can come to the meeting?2

11、.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.第十四页，本课件共有16页If 引导的条件状语从句或宾语从句的练引导的条件状语从句或宾语从句的练习习1 If I _(not understand）,I will ask my teacher for help.2If I _(copy)your homework,I will cheat myself.3I dont know if it _ (rain)tomorrow.4My teacher asked me if I _ (finish)my homework already.dont understand copy will rain had finished第十五页，本课件共有16页感谢大家观看第十六页，本课件共有16页