1、if 条件句条件句I have to stay at home.I will be bored.If I stay at home,I will be bored.I want to go out.You will be wet.If I go out,I will be wet.It will be sunny tomorrow.We will go for a ride.If it is sunny tomorrow,we will go for a ride.It will be sunny tomorrow.I will go swimming with my brother.If i
2、t is sunny tomorrow,I will go swimming with my brother.It will be sunny tomorrow.We will eat ice cream.If it is sunny tomorrow,we will eat ice cream.It will be sunny tomorrow.We will go camping.If it is sunny tomorrow,we will go camping.It will be sunny tomorrow.We will go to the amusement park.If i
3、t is sunny tomorrow,we will go to the amusement park.Grammar Focus:if 条件句条件句I have to stay at home.I will be bored.If I stay at home,I will be bored.I want to go out.You will be wet.If I go out,I will be wet.It will be sunny tomorrow.We will go for a ride.If it is sunny tomorrow,we will go for a rid
4、e.It will be sunny tomorrow.I will go swimming with my brother.If it is sunny tomorrow,I will go swimming with my brother.It will be sunny tomorrow.We will eat ice cream.It will be sunny tomorrow.We will go camping.If it is sunny tomorrow,we will go camping.If it is sunny tomorrow,we will eat ice cr
5、eam.合并合并If I have money,I will buy some food.If I have some food,I will eat them quickly.If I eat them quickly,I will be full.If I am full,I will get fat.If I am fat,I will lose weight.If I lose weight,I will exercise every day.If I exercise every day,I will spend a lot of time.If I spend a lot of t
6、ime,I will not have time to make money.If I dont have time to make money,I will be poor.Look at the pictures and make sentences with“if”.If you go to the party with Karen and Anna,youll have a good time.If you wear jeans to the party,the teachers wont let you in.If you take the bus to the party,youl
7、l be late.If you stay at home,you will be sorry.If you have a robot,what will you do?If I have a robot,I will let ithelp with the housework.babysit my little brother.wake me up in the morning.teach me English after school.1.I think Ill take the bus to the party.If you _(do),you _ _(be)late.2.I think
8、 Ill stay at home.If you _(do),you _ _(be)sorry.3.What will happen if they have the party today?If they _(have)it today,half the class _ _(not come).4.Should we ask people to bring food?If we _(ask)people to bring food,they _ just _(bring)potato chips and chocolate.dowill bedo will behave wont comea
9、skwill bringComplete the sentences.都表示对事情的结果进行预测。都表示对事情的结果进行预测。Can you tell the conjunction(连词连词)that connects the two parts of the sentences?What does it mean?What tenses do the sentences use?一般现在时一般现在时一般将来时一般将来时Whats the meaning of the“do”here?If you take the bus to the party,youll be late.If you
10、stay at home,youll be sorry.e.g.We will go to the park if it _ _(rain)tomorrow.含含if条件状语从句条件状语从句的主从复合句的主从复合句1.If you go there by bike,you will be late./You will be late if you go there by bike.if 条件状语从句中，主句用一般将条件状语从句中，主句用一般将来时来时，从，从句句用用一般现在一般现在时时表表示将来示将来。主主将从将从现现原原则。则。doesntrain2.If you are ill,you m
11、ust go to the doctor.if 条件状语从句中，如果主句条件状语从句中，如果主句有有must，can，may 等情态动词，等情态动词，从句用从句用一般现在一般现在时时。e.g.You must stop if the traffic light _(be)red.ise.g.Don t wait for me if I _(be)late.3.Please call me if you come back.if 条件状语从句中，主句是祈使句条件状语从句中，主句是祈使句，从，从句句用用一般现在一般现在时时表表示将来示将来。主主祈从祈从现现原原则。则。am2.If it _(be)
12、cold tomorrow,I will wear my sweater.3.He can go home if he_(finish)his homework.finishes1.Put up your hands if you _(have)any questions.haveis2)If it _(be)cold tomorrow,I will wear my sweater.3)He can go home if he _(finish)his homework.finishes1)Put up your hands if you _(have)any questions.haveis
13、【语境应用语境应用】完成句子。完成句子。4)如果他来了，我们会让你知道的。如果他来了，我们会让你知道的。If he _,we _ you know.5)如果天不下雨，她会开车来我家的。如果天不下雨，她会开车来我家的。If it _,she _ to my es will letdoesnt rain will drive if will she,call me,I,tell her about itIf she calls me,I will tell her about it.he,come,next weekend,I,tell you If he comes next weekend,I
14、 will tell you.not rain,go hiking,this afternoon If it doesnt rain,I will go hiking this afternoon.no war,the world,more beautifulIf there is no war,the world will be more beautiful.he,have free time,go to Shanghai If he has free time,he will go to Shanghai.if 情态动词情态动词（may/can、should）drive too fast,
15、something bad,happenIf you drive too fast,something bad may happen.he,work hard,pass the examIf he works hard,he can pass the exam.a fire,you call 119,at onceIf there is a fire,you should call 119 at once.ifmeet her,Tell Mary,to give me a callIf you meet her,tell Mary to give me a e to Chengdu,let m
16、e knowIf you come to Chengdu,let me know.Be invited,go to the party,with a small giftIf you are invited,go to the party with a small gift.2.如果如果if 引导的条件状语从句中所表示的引导的条件状语从句中所表示的前提或条件将来可以实现前提或条件将来可以实现或正在进行或正在进行，动词要用，动词要用现在完成时或进行现在完成时或进行时，主句通常用将来时。时，主句通常用将来时。eg：We will give you a good price if you _(thi
17、nk)of buying it.are thinking3.“祈使句祈使句+and/or 引导的结果状语引导的结果状语”中，祈使句在意义中，祈使句在意义上相当于一个上相当于一个 条件状语从句中条件状语从句中。eg：Use your head,and you will find a way.=If you dont use your head,you will find a way.4.如果如果if 引导的条件状语从句有否定词引导的条件状语从句有否定词not，则可与，则可与unless互换。互换。eg:You wont catch the bus if you _(not run).=You w
18、ont catch the bus unless you run.dont run5.If引导的条件状语从句在意义上相当于介词引导的条件状语从句在意义上相当于介词with/without与名词连用。与名词连用。eg：If there is no water,fish will die.=Without water,fish will die.=With no water,fish will die.二、二、含含if宾语从句的主从复合句宾语从句的主从复合句:if 引导的宾语从句是一般疑问句时，构成宾语从句也可用引导的宾语从句是一般疑问句时，构成宾语从句也可用whether连接，表达意思为连接，表
19、达意思为“是否是否”。若句尾有。若句尾有or not，只能，只能whether,不能不能用用if。句尾标点符号取决于主句。句尾标点符号取决于主句,时态根据需要决定。时态根据需要决定。He asked me if/whether I am from Japan.eg：Are you from Japan?He asked me.(变为含变为含宾语从句宾语从句的主从复合句的主从复合句)Lily will come here or not.Could you tell me?(变为宾语从句的主从复合句)Could you tell me whether Lily will come here or
20、not?Do you like watching TV or not?He asked me.He asked me whether I like watching TV?Are you going to Beijing tomorrow?He wondered.He wondered if/whether I am going to Beijing tomorrow.单单项选项选择择。1)_ we deal with our problems,we can easily become unhappy.A.Until B.If C.Unless D.ThoughC解析：解析：Unless we
21、 deal with our problems,we can easily become unhappy.=_ we _ deal with our problems,we can easily become unhappy.If dont 2)Mrs.Li,will you be angry _ your students dont obey the rules in class?A little.But I will stop them in a friendly way.A.if B.unless C.though 3)_ you drive,you mustnt drink wine at all.A.If B.Unless C.ThoughA A 4)You will see many aunts dancing together on the square if it _ in the evening.A.doesnt rain B.rains C.will rain D.wont rainA
