1、人教新目标版 八年级上 Unit 10 If you go to the party, youll have a great time. Section A(2d-3c) 语法：语法： If 引导的条件状语从句引导的条件状语从句 Warming-up Lets enjoy videos and fill in the blanks. If they _(go) to the party, they_ . go will have a great time. =They _(have) a great time if they_(go) to the party. will have go 主
2、将 从 现 从句 主句 If she _ (wear) old clothes, she_ go to the party. If she _(not go) to the party, she_(sad). wears wont doesnt go will be sad =she_ go to the party if she _ (wear) old clothes. wont wears =She_(sad)if she _(not go) to the party. will be sad doesnt go 主 将 从 现 从句 主句 If she _ beautiful clot
3、hes, she_ to the party. If she _ to the party, she_. wears goes will have a great time. will go =She_ go to the party if she _ beautiful clothes. will go wears =She _(have) a great time if she_(go) to the party. will have goes 主 将 从 现 从句 主句 （一般现在时）（一般现在时） （一般将来时）（一般将来时） （一般现在时）（一般现在时） （一般将来时）（一般将来时）
4、 主 将 从 现 主 将 从 现 If I go to the party, Ill have a great time. Ill have a great time if I go to the party. if 条件状条件状 语从句语从句 If sb./sth. , sb./sth. do(es)/am/is/are will do/will be sb./sth. if sb./sth. do(es)/am/is/are will do/will be A B A B 1 2 1 2 if 条件状条件状 语从句语从句 If I have 100 yuan, I will buy som
5、e books. If I buy some books, I will read them every day. If I read books every day, I will get good grades. If I get good grades, my parents will be happy. If my parents are happy, I will get more money. If I get more money, I will buy more books. Lets play “If” game! Chain game Jeff: Hey, Ben. For
6、 the party next week, should we ask people to bring food? Ben: No, lets order food from a restaurant. If we ask people to bring food, theyll just bring potato chips and chocolate because theyll be too lazy to cook. Jeff: OK. For the games, do you think we should give people some small gifts if they
7、win? Ben: I think thats a great idea! If we do that, more people will want to play the games. Jeff: Yes, the games will be more exciting, too. If we ask people to bring food, theyll just bring potato chips and chocolate If we do that, more people will want to play the games. Pre-reading Skim 2d and
8、find out the if-clauses. Read carefully and answer the questions. Reading Task 1.What are Jeff and Ben talking about? 2.Will Ben and Jeff ask people to bring food for the party? 4.What will happen if Ben and Jeff ask people to bring food? Food and games for the party next week. No, they wont. Theyll
9、 just bring potato chips and chocolate because theyll be too lazy to cook. 5. So what will Ben and Jeff do? 6.For the games, will they give people some small gifts if they win? 7.What will happen if we give people some small gifts if they win? Yes, they will. More people will want to play the games.
10、 They will order food from a restaurant. Jeff: Hey, Ben. For the party next week, should we ask people to bring food? Ben: No, lets order food from a restaurant. If we ask people to bring food, theyll just bring potato chips and chocolate because theyll be too lazy to cook. Jeff: Ok. For the games,
11、do you think we should give people some small gifts if they win? Ben: I think thats a great idea! If we do that, more people will want to play the games. Jeff: Yes, the games will be more exciting, too. Listen and repeat. 2d orderfrom 从从预定预定 tooto 太太而不能而不能 1.because theyll be too lazy to cook. “too+
12、形容词形容词/副词副词+to do sth.”表示表示“太太而不能而不能”。在形。在形 式上是肯定结构，但表达的却是否定意义。式上是肯定结构，但表达的却是否定意义。too后接动词原形。后接动词原形。 拓展：拓展：tooto可与可与notenough to do（不够（不够而不能）以而不能）以 及及sothat（如此（如此以至于以至于）进行同义转换。）进行同义转换。 例例： 他太小了，不能去上学。他太小了，不能去上学。(翻译翻译) _ _ _ He is too young to go to school. He is not old enough to go to school. He is
13、so young that he cant go to school. 2.the games will be more exciting, too. 【辨析】【辨析】 exciting,excited exciting令人兴奋的令人兴奋的,用于形容感情方面影响他人的人或事用于形容感情方面影响他人的人或事,主语主语 一般是物或用来修饰物一般是物或用来修饰物,在句中作表语或定语。在句中作表语或定语。 excited为形容词为形容词,表示表示“兴奋的兴奋的”,多指人受到事物的影响多指人受到事物的影响,主语一主语一 般是人或用来修饰人般是人或用来修饰人,在句中作表语。在句中作表语。 例例： Are
14、you _ about going to Beijing? 你要去北京了，感到兴奋吗？你要去北京了，感到兴奋吗？ He told us an _ yesterday. 他昨天给我们讲了一个使人激动的故事。他昨天给我们讲了一个使人激动的故事。 excited exciting story 类似的还有类似的还有 bored/boring; suprised/suprising; interested/interesting. Ben and Jeff are planning for the party _. The wont ask people to bring food. _ they as
15、k people _ (bring) food, they _ (bring) potato chips and _ because they _ too lazy to cook. So they will _ food from a restaurant. For the games, Ben thinks that they should give people some small gifts _ they win. _ they do that, _ people _ to play the games and the games will be _. Consolidation F
16、ill in the blanks according to the conversation. will want more exciting more order to bring will bring if If If will be next week chocolate 1. Read and act 2d out. Role play 2. Retell 2a according to the key expressions: Jeff: Hey, Ben. For the party., should we.? Ben: No, Lets order.from. If., the
17、yll. because.too.to. Jeff: OK. For the., do you think we should.if.? Ben: I think.! If., more people will. Jeff: Yes, the games will be. I think Ill take the bus to the party. If you do, youll be late. I think Ill stay at home. If you do, youll be sorry. What will happen if they have the party today
18、？ If they have it today, half the class wont come. Should we ask people to bring food？ If we ask people to bring food, theyll just bring potato chips and chocolate. If you take the bus to the party, youll be late. If you stay at home, youll be sorry. 为避免重复为避免重复,条件状语从句常用助动词条件状语从句常用助动词do(does/did)来替代上
19、文所提到的动作。来替代上文所提到的动作。 Presentation if引导的条件状语从句引导的条件状语从句if-clause If是连词，表示假设或条件，意思是是连词，表示假设或条件，意思是“ 如果如果的话”的话”，通常表示，通常表示 假设，表示将会发生和可能发生的事，或进行提醒警告。假设，表示将会发生和可能发生的事，或进行提醒警告。 if从句可以放在句首从句可以放在句首, 也可以放在句末。也可以放在句末。 句子结构：句子结构：If+从句从句main clause，主句。，主句。=主句主句+if+从句从句 。 （从句谈论可能的活动，主句谈论可能的结果）（从句谈论可能的活动，主句谈论可能的结果
20、） 我们用“主句用一般将来时我们用“主句用一般将来时, if引导的从句用一般现在时”引导的从句用一般现在时” 的条件的条件 句来谈论句来谈论可能发生可能发生的事件。的事件。if从句的一般现在时用于表述可能发从句的一般现在时用于表述可能发 生的动作或情况生的动作或情况, 主句用一般将来时表述条件成立时可能产生的主句用一般将来时表述条件成立时可能产生的 结果。结果。(即主将从现即主将从现) If he _ late, he _ _late for school. gets up will be =He will be late for school if he gets up late. 句子结构
21、：句子结构：If+从句，主句。从句，主句。=主句主句+if+从句。从句。 可能发生的可能发生的 事件事件 （主将从现）（主将从现） What will happen if he is late? If he late, his teacher angry. =His teacher will be angry if he is late. is will be 可能发生的可能发生的 事件事件 （主将从现）（主将从现） What will happen if his teacher is angry ? If his teacher angry , he sad. =He will be sad
22、 if his teacher is angry. is will be 可能发生的可能发生的 事件事件 （主将从现）（主将从现） Video time Lets enjoy a song and try to fill in the blanks. If you_ happy,and you _ it, _your hands.(Clap!Clap!) If youre happy,and you know it, Clap your hands.(Clap!Clap!) If you_ happy,and you _ it, Then, your face _ surely_ it, If
23、 youre happy,and you know it, Clap your hands.(Clap!Clap!) If you_ happy,and you _it, _ your feet.(Stomp!Stomp!) are know clap are know will show are know stom if引导的条件引导的条件 状语从状语从句句 注意注意： 1.如果主句是 如果主句是祈使句祈使句，那么从句通常要用一般现在时。，那么从句通常要用一般现在时。 (即主祈从现即主祈从现) If you _ (want) to have a chat ,_ (call) me up. 如
24、果你想聊天，打我电话。如果你想聊天，打我电话。 _ (not wait) for me if I _ (be) late. 如果我迟到，就别等我。如果我迟到，就别等我。 改同义句：改同义句： want call Dont wait am Call me up if you want to have a chat. If I am late,dont wait for me. 注意：注意：if引导的条件状语从句通常不用一般将来时。引导的条件状语从句通常不用一般将来时。 注意注意： 2.如果主句是含有 如果主句是含有must，can，may 等情态动词时，根据需等情态动词时，根据需 要从句多用一般
25、现在时要从句多用一般现在时the simple present tense。(即主情即主情 从现从现) You can _ the exam if you _ (work) hard. 如果你努力学习，你就能通过这次考试。如果你努力学习，你就能通过这次考试。 You must _ if the traffic light _ (be) red. 如果交通灯是红色，你必须停下来。如果交通灯是红色，你必须停下来。 改同义句：改同义句： pass work stop is If you work hard,you can pass the exam. If the traffic light is
26、red,you must stop. 注意：注意：if引导的条件状语从句通常不用一般将来时。引导的条件状语从句通常不用一般将来时。 注意注意： 4.表示真实条件、客观真理、自然现象、定理定义、表示真实条件、客观真理、自然现象、定理定义、 民间民间 谚语等，句型是：谚语等，句型是：If + 句子句子 （一般现在时（一般现在时 ），），+ 主句主句 （ 一般现在时）一般现在时）.(即主现从现即主现从现) 必然的结果必然的结果 the result that will certainly happen 如果温度低于零摄氏度如果温度低于零摄氏度, 水就会变成冰。水就会变成冰。 If the tempe
27、raturet_ below zero, water _ (turn) into ice. =Water _(turn) into ice if the temperature_below zero. is turns turns is if 条件句不一般，几个要点记心间； 条件句，放在前，逗号要居中间； 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。 注意：注意： 1.if还可以用于宾语从句中，还可以用于宾语从句中，表示表示“是否是否”，相当于，相当于 whether，引，引 导宾语从句，时态需根据语境确定。导宾语从句，时态需根据语境确定。 如：如：I dont know i
28、f it will rain tomorrow. 我不知道明天是否会下雨。我不知道明天是否会下雨。 记忆口诀记忆口诀： 2.If条件句还有同义句：条件句还有同义句： 祈使句，祈使句，and /or+将来时态的陈述句。将来时态的陈述句。 Work hard ,and you will make great progress.（and 并且并且） =If you work hard,you will make great progress. 如果你努力学习，你才会取得大的进步。如果你努力学习，你才会取得大的进步。 Hurry up, or you will be late.（or 否则否则） =I
29、f you dont hurry up. you will be late. 如果你不快点，你就要迟到了如果你不快点，你就要迟到了 If I have a dream, I _ working on it seriously. 【2018 昌平一模】昌平一模】 A. keep B. kept C. will keep D. keeping 【考点精析】本题考查条件状语从句的基本用法。【考点精析】本题考查条件状语从句的基本用法。if是条件状语是条件状语 从句的引导词之一，意思是从句的引导词之一，意思是“如果如果”，当条件状语从句所连接的，当条件状语从句所连接的 两个动作还未发生时，要遵循主将从现
30、原则，即主句用将来时两个动作还未发生时，要遵循主将从现原则，即主句用将来时 （一般将来时为主），从句用现在时（一般现在时为主），本（一般将来时为主），从句用现在时（一般现在时为主），本 题句意为题句意为“如果我有一个梦想的话，我就会一直努力认真地实现如果我有一个梦想的话，我就会一直努力认真地实现 它它”。可知。可知“有梦想有梦想”和和“不断努力不断努力”的动作均未发生，故应用主将的动作均未发生，故应用主将 从现原则，答案为从现原则，答案为C。 (2017湖北咸宁湖北咸宁)一一Celia, join us in the Super Summer Camp if it _this weekend.
31、 一一Id love to. But nobody knows if it _ . A. is fine; rains B. is fine; will rain C. will be fine; will rain D. will be fine; rains 【答案】【答案】B 【解析】本题【解析】本题第一空第一空考查考查if（如果）（如果）条件状语从句的基本条件状语从句的基本 用法。句意为用法。句意为“如果这周末天气好的话如果这周末天气好的话.”，第二空意为，第二空意为 “没人知道是否会下雨没人知道是否会下雨”，if在此表示在此表示“是否是否”。答案为答案为B。 Consolidatio
32、n unless引导的条件状语从句引导的条件状语从句 unless是连词，表示假设或条件，意思是是连词，表示假设或条件，意思是“意为“除非”，和意为“除非”，和 ifnot(如果如果不不)的意思相近，且两个结构通常可以互换使用。的意思相近，且两个结构通常可以互换使用。 If you dont finish your homework, I wont let you play outside. 如果你不完成你的作业如果你不完成你的作业, 我不会让你出去玩。我不会让你出去玩。 = Unless you finish your homework, I wont let you play outsid
33、e. 除非你完成你的作业除非你完成你的作业, 否则我不会让你出去玩。否则我不会让你出去玩。 注意：在注意：在unless引导的从句里，通常用现在时表示将来。引导的从句里，通常用现在时表示将来。 【运用运用】 用 用unless 和和 ifnot完成句子。完成句子。 1. 如果明天不下雨，我们就去远足。如果明天不下雨，我们就去远足。 If it _, we will go hiking. =We will go hiking _. 2. 除非天下雨，他通常是走路去上学。除非天下雨，他通常是走路去上学。 He usually _ on foot if it _. =_, he usually _
34、on foot. 3. 如果你现在不走，你就赶不上火车了。如果你现在不走，你就赶不上火车了。 If you _, you _ the train. = _, you _ the train. unless it rains tomorrow doesnt rain tomorrow goes to school Unless it rains goes to school doesnt rain dont leave now Unless you leave now wont catch wont catch 注意注意： ifnot和 和unless引导的从句和主句的位置可以互换。但是引导的从
35、句和主句的位置可以互换。但是 当从句在前当从句在前, 主句在后时主句在后时, 一般用逗号隔开一般用逗号隔开, 反之反之, 则不用则不用 逗号。逗号。 If she doesnt start off now, she will be late. She will be late if she doesnt start off now. 如果她现在不出发如果她现在不出发, 她会迟到。她会迟到。 Unless she starts off now, she will be late. She will be late unless she starts off now. 除非她现在出发除非她现在出发
36、, 否则她会迟到。否则她会迟到。 注意：注意：unless用于引出某事发生或成立所必需的条件。用于引出某事发生或成立所必需的条件。 【2018西城二模】西城二模】 Mary often walks the dog in the afternoon _ bad weather stops her. A. when B. unless C. because D. since 【答案】【答案】B 【解析】本题【解析】本题第一空第一空考查考查unless（除非）（除非）条件状语从句的基条件状语从句的基 本用法。句意为本用法。句意为“玛丽经常下午遛狗，除非坏天气拦住她玛丽经常下午遛狗，除非坏天气拦住她”
37、， When当当.时候，时候，because因为，因为，since自从，和句子意思不符自从，和句子意思不符。 3a Fill in the blanks with the correct forms of the verbs in brackets. Dear Su Mei, I dont _ (know) what to _ (do) about going to Mikes birthday party tomorrow night. My parents _ (think) I should study for my English exam next week. If I _ (go)
38、 to the party, they _ (be) upset.Mike _ (tell) us to wear nice clothes, but I dont _ (have) any. If I _ (wear) jeans, I _ (look) the worst. Also, Im not sure how to _ (go) to the party. If I _ (walk), it _ (take) me too long. If I _ (take) a taxi, it _ (be) too expensive. Can you give me some advice
39、 please? Tina know do think go will be tells have wear will look go walk will take take will be upset不安的不安的 advice 建议（不可数名词）建议（不可数名词） 3b Complete the sentences using your own ideas. 1. If I get up late tomorrow, _ 2. If I dont finish my homework, _ 3. If I dont get enough exercise, _ 4. I will not h
40、ave enough time to study if _ 5. I will not make any friends if _ 1. Ill be late for school. 2. my parents will be upset. 3. Ill become very heavy. 4. I play chess after school every day. 5. I dont go to my friends parties. Write a story with your group on a piece of paper. The first person begins t
41、he story with “I think I will.” The others add sentences with “if”. Pass the paper around twice. Then read the story. 3c I think I will go to the movies tonight. If I go to the movies, I wont finish my homework. If I dont finish my homework . Chain story: Fun time now! Chain story: If I get up at 9:
42、00 tomorrow, Ill be late. If I am late, the teacher will be very angry. If the teacher is very angry, he will call my mother. If he calls my mother, she will cry. If she cries, I will be sad. If I am sad, I will eat a lot. If I eat a lot, I will be very fat. If I am very fat, I wont be handsome. If If winter comes, can spring be far behind? -Ode To The West Wind by Shelly
