初二if条件句

1、Unit 5 If you go to the party, you will have a great time.,If 引导的条件状语从句,（主现从现）,If you heat it， snow turns into water.,条件句表事实, 主句常用现在时,If you _ ice, it _into water. (heat/turn) 2. A balloon _ if you _ a pin into it. (burst/stick) 3. If you _ steam, it _ into water. (cool/turn) 4. Metal _ if you _ it.

2、 (melt/heat) 5. Wood _ if you _ it into water. (float/put) 6. A glass _ if you _it. (break/drop),heat,melts,put,floats,drop,breaks,turns,bursts,turns,heat,cool,stick,1.主祈从现 2.主情（can，may，should，must）从现 3.主将从现 if will/wont,祈使句 + if条件状语从句 If条件状语从句，+ 祈使句,if条件状语从句要用一般现在时。,句型结构,时态,1.主祈从现,If you want to ge

3、t 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 teacher carefully. do homework by yourself.,copy your homework. talk in the class cheat in the exams,1.主祈从现,Complete the sentences with the correct form of the words.,1.I

4、f you _(listen) to the music, _ (buy) a CD. 2. If he_ (be) late for school, _ (not wait ) for him. 3. If you _ (buy) a new camera, _ (get) a good one. 4. If the light _ (not come) on, _ (wait) for one minute.,is,buy,get,doesnt come,wait,dont wait,listen,buy,Revision,If you feel hungry, you should ea

5、t something.,If you feel tired, you must have a rest.,2.主情从现,If you are ill, you should go to see a doctor.,If you are riding a bike in the street, you must be very careful.,2.主情从现,（主将从现）,If it is hot, we will go swimming.,条件句表可能,主句多用将来时；,Play a guessing game,What will happen if I touch(触摸) it?,If y

6、ou touch(碰） it, it will _,get angry,Will it ?,cry,dance,smile,If Im hungry, I will_.,If Im tired, I will_.,eat some food,have a rest,3.主将从现,If Im ill, _.,I will see a doctor,If Im late, _.,I will say sorry,3.主将从现,If it rains tomorrow, I_.,will watch TV at home,If it _ tomorrow, _.,Ill play basketbal

7、l,doesnt rain,I wont_.,play basketball,if条件句不一般, 几个要点记心间。 条件句放在前, 逗号要放句中间。 条件句表可能, 主句多用将来时； 条件句表事实, 主句常用现在时。 if条件句有特点, 现在时把将来替； 这个规则要牢记!,if条件句歌诀,从句,主句,，,主句,从句,（一般现在时）,（一般将来时）,（一般现在时）,（一般将来时）,主将从现,If you do it, you will be happy.,Youll be happy if you do it.,What will you do if youre happy?,If Im hap

8、py, I will _. If Im happy, I will _. If Im happy, I will _. If Im happy, I will _.,clap my hands,stamp my feet,wink my eyes,nod my head,1.If it rains tomorrow, we _ visit the museum. A dont do B wont go C arent go D didnt go. 2 Will you go to the park if it _ fine? A will be B was C is D / 3. If I _

9、 too much TV, my mother will _. A watch, angry B watched, be angry C watch, be angry D will watch, be angry,B,C,C,4 If you _ to school late, your teacher _ angry with you. A come; are B come, will be C will come; are D will come; will be 5 If you _ hard, you will _ successful. A work, are B works, i

10、s C to work, be D work, be,B,D,用括号内所给词的正确形式填空,1.Im sure if he _(go) to the party, he_ (have) a great time. 2.If the rain _(stop) tonight, we will go to the cinema. 3.Ill buy a computer if I _(have) enough money.,goes,will have,stops,have,4.You _(not get) nervous if you _(do ) enough exercise. 5.If s

11、he _ (be) kind to me , I _(not argue) with her. 6.I want to know if he _(come) tomorrow, if he _(come), I _(give) the massage to him. 7.If you _(pay) more attention to that, he _(not get) injured.,wont get,do,is,wont argue,comes,comes,will give,pay,wont get,1.Im sure if he _(go) to the party, he_ (h

12、ave) a great time. 2.If the rain _(stop) tonight, we will go to the cinema. 3.Ill buy a computer if I _(have) enough money. 4.You _(not get) nervous if you _(do ) enough exercise. 6.I want to know if he _(come) tomorrow, if he _(come), I _(give) the massage to him.,goes,will have,stops,have,wont get

13、,do,comes,will come,will give,If he_ (feel) well, he _ (go) to work tomorrow. If my mother _(have) time, she _ (take) me to the museum. If it _ (not rain) tomorrow, they _(go) for an outing. If they _ (be) free, they _ (play) a football match. If it _ (rain), we _ (not go) out. If he _ (not work) ha

14、rd, he _ (fail) in the exam. If he _(not have) time, he _ (not go) to the museum.,feels,will go,has,will take,doesnt rain,will go,are,will play,rains,wont go,doesnt work,will fail,doesnt have,wont go,If you dont leave now, you will be late for school Unless you leave now, you will be late for school

15、.,if not,unless,1.You improve your handwriting/ you will lose marks in the exam If you dont improve your handwriting,Unless you improve your handwriting,1.You improve your handwriting/ you will lose marks in the exam If you dont improve your handwriting,you will lose marks in the exam.,2. you will h

16、ave toothache/ you clean your teeth,If you dont clean your teeth,Unless you clean your teeth,you will have toothache.,3.this room will get very hot / you put the air conditioning on soon,If you dont put the air conditioning on soon,Unless you put the air conditioning on soon,this room will get very

17、hot.,4. you keep ice-cream in a fridge/it melts,If you dont keep ice-cream in a fridge,Unless you keep ice-cream in a fridge,it melts.,总 结,1、主现从现 (条件句表事实) If you heat it, snow turns into water. 2、主将从祈 If you want to get good marks, study hard. 3、主情（can,may,should,must）从现 If you feel tired, you must

18、have a rest. 4、主将从现 (条件句表可能) if will/wont If it is hot, we will go swimming. If you dont clean your teeth, you will have toothache. Unless you clean your teeth, you will have toothache.,If he _ back, please let me know. Do you know if he_ back next week?,come,comes,will come,If 在条件状语从句中表示如果，在谓语动词之后引导宾语从句表示是否，相当于whether。,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）,1.引导宾语从句：“是否”，表不确定的概念。,I dont know if your father can come together . Can you tell me if miss your parents ?,e.