if真实条件句PPT课件

1、.,1,if引导的真实条件句,If you want to watch this film, I will buy two tickets. If I buy two tickets, we can go to the cinema. If we are watching the film, please keep quite. If you have finished dinner, Ill ask the waiter for the bill.,.,2,主将从现,主句将来时,从句现在时,一般将来时,祈使句,含情态动词,一般现在时,现在进行时,现在完成时,.,3,如果你拉猫的尾巴，它就会抓

2、(scratch)你。 If you pull the cats tail, it will scratch you. 如果你想减肥，你应该少吃糖。 If you want to lose weight, you must eat less candy.,.,4,Lecture TwelveGrammar,if 引导真实条件句中 主谓语省略,.,5,If he is in trouble, he will turn to police for help. If in trouble, he will turn to police for help. If you are offered hel

3、p, you must never forget to say Thank you. If offered help, you must never forget to say Thank you.,.,6,If (you are) in Rome , you must do as Romans do.,主句，从句主语相同,从句谓语中有 be,方法一： 主从句主语相同,if从句中有 be,则if从句中主语、谓语可省略。,.,7,Have a try,1.If you are studying English , you must pay attention. 2.If two rivals m

4、eet , the strong-minded one will win. 3.If he is free , he will go with us. 4.If you want to have happiness , you will get health , knowledge and virtue.,.,8,1.如果冰被加热，它就会变成水。 If heated, the ice will turn to water. 2.如果你在武汉，你可以尝尝热干面。 If in Wuhan, you can try hot-dry noodles . 3.如果你正在开车，你应该专心。 If driv

5、ing, you must drive with concentration.,.,9,If it is necessary, he will turn to police for help. If (it is) necessary, he will turn to police for help. If it is possible, he will call the police. If (it is) possible, he will call the police.,.,10,If (it is) necessary , Ill explain to you again.,方法二：

6、 if从句中主语是it ,谓语中有 be,则if从句中主语、谓语可省略(it be 省略)。,.,11,Have a try,1.回答这些问题，如果可能的话不要参考书本。 Answer these questions ,if without referring to the books. 2.如果有必要，你可以帮我们做点事。 If , you can help us to do something. 3.如果明天天气好，我们就去划船。 If , we will go boating.,( it is ) necessary,( it is) fine tomorrow,( it is ) po

7、ssible,.,12,4.如果有必要，你要再试一次。 If (it is) necessary, you will try again. 5.如果是真的，这条信息会很重要。 This information will be important, if (it is) true.,.,13,unless引导真实条件句,We cant watch the film unless we buy tickets. We cant watch the film if we dont buy tickets. We will miss the film unless we hurry up. We wi

8、ll miss the film if we dont hurry up.,.,14,如果你30岁还没结婚，你就成了一个剩女。 Unless you get married in your 30, you will be a 3S lady. 2.如果你不积极寻找白马王子，你就会错失良机。 Unless you hunt for your Mr.Right actively, you will miss the opportunity.,unless= if not (除非否则，如果不),.,15,Have a try,1.除非你确立了目标 ，否则你就会失去方向。 Unless you set

9、 goals, you will lose your way. 2. 如果你不快点，你就见不到Eason。 Unless you hurry up, you wont see Eason.,.,16,主谓语省略,If Eason is not invited, he wont come to the party. Unless Eason is invited, he wont come to the party. If not invited, he wont come to the party. Unless invited, he wont come to the party.,.,17

10、,If it is not necessary, youd better not to interrupt Eason. Unless it is necessary, youd better not to interrupt Eason. If not necessary, youd better not to interrupt Eason. Unless necessary, youd better not to interrupt Eason.,.,18,Have a try,1.Unless ( ) to speak, you must remain silent at the co

11、nference. invited B. inviting C. being invited D. having invited 2.The school rules state that no child shall be allowed out of the school during the day, ( ) accompanied by an adult. A. once B. when C. if D. unless,A,D,.,19,3.如果没必要，你最好不要查字典。 ，youd better not refer to the dictionary. 4.如果明天不下雨，我们就去野餐。 , we wi