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初中英语 if引导的条件状语从句,主讲人:xx 单位:正定县北早现乡,eg:如果我有足够的钱,我就去环游世界,If 引导条件状语从句,定义:if “如果, 假如” 它引导的句子表示某事发生所需的条件,即“在条件下,某事才能发生”,在句子中充当状语,因此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,_ 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,但是放在主句之前须有逗号隔开,If it rains tomorrow, I_.,will watch TV at home,If it _ tomorrow, _.,hell play basketball,doesnt rain,I wont_.,play basketball,I will_ if Im hungry.,I will_ if Im tired.,Look and say,eat some food,have a rest,位置:从句可放在主句之前或之后,但是放在主句之前须有逗号隔开,If条件句:条件句用于陈述语气,表示假设的情况可能发生, 其中 if 是“如果”的意思。 主句一般将来时 ,从句用一般现在时。,用法: 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 is red. If you finish the homework, you can go home 如果你作业做完了就可以回家了。 If you want to lose weight you must/should eat less bread. 如果你想减肥,你必须少吃面包。,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.,练一练: 1。如果她早点儿起床,就有时间在家里吃早餐 If she_ _a little earlier, shell have time to eat breakfast at home. 2。如果你参加聚会,你将会过得很开心。 If you_ the party ,you_ _ a great time. 3。如果明天下雨,我们将不去野餐 If it _tomorrow, we _ _ for a picnic. 4。如果你经常听英文歌,你将会喜欢英语 If you often _ _English songs, you_ _English.,语法:,例句If I have enough money, I will travel around the world :,if引导的条件状语从句,if:从属连词,意思是:“如果,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引导的条件状语从句既可以放在句子前, 也可以放在句子后。 从句位于主句之前时,常用逗号将其与主句隔开。,结构:,主句谓语中也可以含有情态动词,如:must,can,could,should等,时态:,if引导的条件状语从句, 主句用一般将来时(will),从句用一般现在时。,例句:If people obey the traffic rules, there will be fewer accidents.,主句谓语中也可以用had better(not)do,提建议,例句:如果交通指示灯是红的,你必须停下来等一等。,eg:If the traffic lights are red,you must stop and wait.,例句:如果你想减肥,你最好锻炼。,eg:If you want to lose weight,you had better take some exercise.,“主将从现”,if的反义词:if.not.=unless,意思是:“如果不,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,变换:,1.有if引导的条件状语从句的复合句中,当主句和从句的 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,2. 借助介词with 或without来转换。 例如: If you help me, Ill finish my job soon. -, Ill finish my job soon. 如果你帮我,我将很快完成我的工作。 If there is no water, fish may die. Fish may die -. 如果没有水,鱼可能会死。,With your help,without water,注意事项 1. 在if引导的条件状语从句中,当主句是一般将来时时,不能够使用be going to结构,而要用will。 例如: Ill help you with your English if I am free tomorrow. 如果明天我有空,我会帮你学英语。 2. 在if引导的条件状语从句中不能够使用some,而要用any。 例如: If you have any questions to ask, please come to my office. 如果你有问题要问的话,请到我办公室来。,练习: 1、如果明天下雨,我就和同学们去野餐。 2、如果你起来晚了,你上学将迟到。 3、如果你想节约能源,你最好骑自行车。 4、如果朋友有麻烦,我们应该尽力帮助他们。,See you !,
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