初中英语：If引导的条件状语从句.pptx

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,2021/10/3,#,初中英语,if引导条件状语从句,主讲人：xx,单位：正定县北早现乡,第1页,eg:,假如我有足够钱，我就去周游世界,If,引导条件状语从句,定义：,if,“,假如,假如,”,它引导句子表示某事发生所需条件，即,“,在,条件下，某事才能发生”，在句子中充当状语，所以称之为条件状语从句。,If I have enough money,I will travel around the world,orI will travel around the world if I have enough money,第2页,_,if Im ill.,I will see a doctor,Look and say,If Im late,_.,I will say sorry,位置：从句可放在主句之前或之后，不过放在主句之前须有逗号隔开,第3页,If it rains tomorrow,I_.,will watch TV at home,If it _ tomorrow,_.,hell play basketball,doesnt rain,I wont_.,play basketball,第4页,I will,_,if Im hungry.,I will,_,if Im tired.,Look and say,eat some food,have a rest,第5页,位置,：,从句可放在主句之前或之后，不过放在主句之前须有逗号隔开,第6页,If,条件句：,条件句用于陈说语气，表示假设情况可能发生，,其中,if,是,“,假如,”,意思。,主句,普通未来时,，从句用普通现在时。,构成,条件从句,主句,时态,If普通现在时,主语,shall/will,+动词原形,例句,If he comes,he will take us to the zoo.,第7页,使用方法：,1.,假如主句是普通未来时，从句则用普通现在时。,If it rains,（从句），,I will stay at home.,Ill go with you if you dont want to go alone,（从句）,.,2.,假如主句含有,must,may,can,等情态动词，从句也要用,普通现在时。,If you drive too fast,you may have an accident.,You must stop if the traffic is red.,If you,finish,the homework,，,you,can go,home,假如你作业做完了就能够回家了。,If you,want,to lose weight you,must/should eat,less bread.,假如你想减肥，你必须少吃面包。,第8页,3.假如主句是祈使句，从句一样要用普通现在时。,Dont go and play football if you dont finish your homework.,Please call me if he comes next Sunday.,第9页,练一练：,1,。假如她早点儿起床，就有时间在家里吃早餐,If she_ _a little earlier,shell have time to eat,breakfast at home.,2,。假如你参加聚会，你将会过得很开心。,If you_ the party,you_ _ a great time.,3,。假如明天下雨，我们将不去野餐,If it _tomorrow,we _ _ for a picnic.,4,。假如你经常听英文歌，你将会喜欢英语,If you often _ _English songs,you_ _English.,第10页,第11页,语法：,例句,If I have enough money,I will travel around the world,：,if引导条件状语从句,if:隶属连词，意思是：“假如，假如，倘若”,从句,主句,I will travel around the world if I have enough money.,.,原句可改为：,if引导条件状语从句既能够放在句子前，,也能够放在句子后。,从句位于主句之前时，惯用逗号将其与主句隔开,。,结构,：,第12页,第13页,主句谓语中也能够含有情态动词，如：must,can,could,should等,时态,：,if引导条件状语从句，,主句用普通未来时（will）,从句用普通现在时。,例句,：,If,people obey the traffic rules,there,will,be,fewer accidents,.,主句谓语中也能够用had better(not)do,提提议,例句,：,假如交通指示灯是红，你必须停下来等一等。,eg:If the traffic lights are red,you must stop and wait.,例句：假如你想减肥，你最好锻炼。,eg:If you want to lose weight,you had better take some exercise.,“主将从现”,第14页,if反义词：if.not.=unless,意思是：“假如不，除非”,I wont go there unless I hear from you.(同义句),I wont go there _ I _hear from you.,if dont,I wont go,to the party if,I,am not invited同义句),I wont go,to the party,_,I,am invited.,unless,第15页,变换：,1.有if引导条件状语从句复合句中，当主句和从句,主语均为you时，可转换为“祈使句，and+简单句”或,“祈使句，or+简单句”,You,can pass the exam if,you,work hard.,-,，and you will pass the exam.,If,you,dont hurry up,you,will be late again.,Hurry up,-you will be late again.,Work hard,or,第16页,2.,借助介词with 或without来转换。,比如:,If you help me,Ill finish my job soon.,-,Ill finish my job soon.,假如你帮我，我将很快完成我工作。,If there is no water,fish may die.,Fish may die -.,假如没有水，鱼可能会死。,With your help,without water,第17页,注意事项,1.在if引导条件状语从句中，当主句是普通未来时时，不能够使用be going to结构，而要用will。,比如：Ill help you with your English if I am free tomorrow.假如明天我有空，我会帮你学英语。,2.在if引导条件状语从句中不能够使用some，而要用any。,比如：If you have any questions to ask,please come to my office.假如你有问题要问话，请到我办公室来。,第18页,练习：,1、假如明天下雨，我就和同学们去野餐。,2、假如你起来晚了，你上学将迟到。,3、假如你想节约能源，你最好骑自行车。,4、假如朋友有麻烦，我们应该尽力帮助他们。,第19页,See you!,第20页,