if四种条件句 (课堂PPT)
合集下载
初二if条件句 ppt课件
3.I’ll buy a computer if I _h_a_v_e__(have) enough
money.
4.You __w_o_n_’t__g_e_t (not get) nervous if you
_d_o___(do ) enough exercise.
6.I want to know if he __w_i_ll_c_o_m_e_(come)
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3.主将从现
If I’m ill, _I__w_i_ll__s_e_e__a__d_o_c_t_o_r.
If I’m late, _I__w_i_ll__s_a_y__s_o_r_r_y__.
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If it rains tomorrow, I_w_i_ll__w_a_t_c_h__T__V__a_t__h_o_m_.e I won’t__p_la_y__b__a_s_k_e_t_b_a_l_l .
3.I’ll buy a computer if I __h_a_v_e_(have) enough money.
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4.You _w_o_n_’t__ge_t(not get) nervous if you __d_o__(do ) enough exercise.
5.If she ___is_ (be) kind to me , I __w_o_n_’t__ar_g_u_e(not argue) with her.
If you feel tired, you must have a rest.
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2.主情从现
If you are ill, you should go to see a doctor.
if条件句教学课件pptx
根据程序逻辑，使用if条件句 实现条件判断，并根据条件执
行相应的代码块。
添加注释和说明
为程序添加必要的注释和说明， 以便他人理解和维护程序。
程序调试与运行
检查语法错误
检查程序中是否存在语 法错误，如拼写错误、
缺少括号等。
调试程序
使用调试工具或打印语 句等方法，对程序进行 调试，找出程序中的错
误和问题。
04
不断学习和探索新的编 程技术和方法，提高编 程效率和质量。
THANKS
感谢观看
REPORTING
运行程序
在调试无误后，运行程 序并观察程序的输出结
果是否符合预期。
修改和完善程序
根据运行结果和反馈， 对程序进行修改和完善， 以提高程序的正确性和
效率。
程序优化与改进建议
优化算法
根据程序的具体需求和场景，选 择合适的算法和数据结构，以提
高程序的执行效率。
减少重复代码
对程序中的重复代码进行提取和 封装，以减少代码冗余和提高代 码的可维护性。
if条件句教学课件 pptx
REPORTING
• 引言 • if条件句基本概念 • if条件句在编程中的应用 • if条件句语法详解 • if条件句实例分析 • if条件句编程实践 • 总结与展望
目录
PART 01
引言
REPORTING
目的和背景
帮助学生掌握if条件 句的基本用法和规则
培养学生的逻辑思维 和判断能力
单分支if条件句
01
只有一个if语句和一个代码块，根据条件的真假执行相应的操作。
双分支if-else条件句
02
包含一个if语句和一个else语句，根据条件的真假选择不同的代
行相应的代码块。
添加注释和说明
为程序添加必要的注释和说明， 以便他人理解和维护程序。
程序调试与运行
检查语法错误
检查程序中是否存在语 法错误，如拼写错误、
缺少括号等。
调试程序
使用调试工具或打印语 句等方法，对程序进行 调试，找出程序中的错
误和问题。
04
不断学习和探索新的编 程技术和方法，提高编 程效率和质量。
THANKS
感谢观看
REPORTING
运行程序
在调试无误后，运行程 序并观察程序的输出结
果是否符合预期。
修改和完善程序
根据运行结果和反馈， 对程序进行修改和完善， 以提高程序的正确性和
效率。
程序优化与改进建议
优化算法
根据程序的具体需求和场景，选 择合适的算法和数据结构，以提
高程序的执行效率。
减少重复代码
对程序中的重复代码进行提取和 封装，以减少代码冗余和提高代 码的可维护性。
if条件句教学课件 pptx
REPORTING
• 引言 • if条件句基本概念 • if条件句在编程中的应用 • if条件句语法详解 • if条件句实例分析 • if条件句编程实践 • 总结与展望
目录
PART 01
引言
REPORTING
目的和背景
帮助学生掌握if条件 句的基本用法和规则
培养学生的逻辑思维 和判断能力
单分支if条件句
01
只有一个if语句和一个代码块，根据条件的真假执行相应的操作。
双分支if-else条件句
02
包含一个if语句和一个else语句，根据条件的真假选择不同的代
if条件句精品课件.ppt
Compare and find the difference
If I have time tomorrow, I will go with you. a fact
If I were a bird, I would fly in the sky. a wish
If I have a lot of money, I will travel around the world.
If everyone could give a hand to others, the world would become better in the future.
If apology were useful, we would not need the
police.
道明寺
If they were here, they would help you. 含义：They are not here, they can’t help you.
a. If they w__e_r_e (be) here, they _w_o_u_l_d_t_a_k_e_ (take) your advice.
b. If the world-war _b_u_r_s_t (burst) out again, what _w_o_u_l_d__h_a_p_p_e_n_ (happen) to our people on earth?
定义：非真实条件句表示所提出的 假设实现可能性极小或与事实相反
How to use?
主句＋would/could/should/might+V, if+过去时（be动词都用were)
What would you do if you won the lottery? If I won the lottery, I would…
if条件虚拟句ppt课件
今天早上，她要是不叫我的话，我就会睡过 头了。
经营者提供商品或者服务有欺诈行为 的，应 当按照 消费者 的要求 增加赔 偿其受 到的损 失，增 加赔偿 的金额 为消费 者购买 商品的 价款或 接受服 务的费 用
与将来事实相反的虚拟
❖If you came tomorrow, we would have the meeting.
1) If he ______ drunk, he wouldn't have lost control of the car.
A. wasn't B. weren't C. hasn't been D. hadn't been
2) I would have gone to the concert, if I _____
6)___, I would take an umbrella with me.
• Had I been you
B. I were you
A. C. Were I you
D. I had been you
7) If you were older, I ____ you to go there
yesterday.
A. will allow
B. should allow
C. would have allowed D. had allowed
经营者提供商品或者服务有欺诈行为 的，应 当按照 消费者 的要求 增加赔 偿其受 到的损 失，增 加赔偿 的金额 为消费 者购买 商品的 价款或 接受服 务的费 用
（三）、虚实错综句
A. had had B. has C. had D. would have 49. All of us would have enjoyed the party much
经营者提供商品或者服务有欺诈行为 的，应 当按照 消费者 的要求 增加赔 偿其受 到的损 失，增 加赔偿 的金额 为消费 者购买 商品的 价款或 接受服 务的费 用
与将来事实相反的虚拟
❖If you came tomorrow, we would have the meeting.
1) If he ______ drunk, he wouldn't have lost control of the car.
A. wasn't B. weren't C. hasn't been D. hadn't been
2) I would have gone to the concert, if I _____
6)___, I would take an umbrella with me.
• Had I been you
B. I were you
A. C. Were I you
D. I had been you
7) If you were older, I ____ you to go there
yesterday.
A. will allow
B. should allow
C. would have allowed D. had allowed
经营者提供商品或者服务有欺诈行为 的，应 当按照 消费者 的要求 增加赔 偿其受 到的损 失，增 加赔偿 的金额 为消费 者购买 商品的 价款或 接受服 务的费 用
（三）、虚实错综句
A. had had B. has C. had D. would have 49. All of us would have enjoyed the party much
if-的用法PPT课件
1. If they had started earlier，they would have arrived in time． 要是他们早些有时可省略，然后将主 语与所用的限定动词(尤其是were，had，should) 倒置。
1. Should it (=if it should)be necessary，I will go. 倘若有必要，我会去的。 2. Were I(=if I were) in your place，I would do the same. 如果我处于你的位置，我也会这样干的5
C 虽引导宾语从句，但为了强调宾语部分，也
可把从句放在句首，此时只用whether不用if。 Whether he will come I am not sure. 他是不是来我拿不准。
D 从句作介词宾语时只用whether不用if。
It depends on whether it will be fine.那 得看是不是晴天。
四、if引导时间状语从句，当if做“当”或 “无论何时”解而不含有条件之义时，if从句 中的时态与主句中的时态相同。
1. If you mix yellow and blue，you get green． 你将黄色与蓝色混合，便会得到绿色。 2. If she wants the servant，she rings the bell. 每当她需要仆人时，她便按铃。
A. too many B. many too C. too much D. much too
10. I’ll give the book to him if he _B__ here next Sunday.
E 作discuss等动词的宾语时，用whether不
用if。
1. Should it (=if it should)be necessary，I will go. 倘若有必要，我会去的。 2. Were I(=if I were) in your place，I would do the same. 如果我处于你的位置，我也会这样干的5
C 虽引导宾语从句，但为了强调宾语部分，也
可把从句放在句首，此时只用whether不用if。 Whether he will come I am not sure. 他是不是来我拿不准。
D 从句作介词宾语时只用whether不用if。
It depends on whether it will be fine.那 得看是不是晴天。
四、if引导时间状语从句，当if做“当”或 “无论何时”解而不含有条件之义时，if从句 中的时态与主句中的时态相同。
1. If you mix yellow and blue，you get green． 你将黄色与蓝色混合，便会得到绿色。 2. If she wants the servant，she rings the bell. 每当她需要仆人时，她便按铃。
A. too many B. many too C. too much D. much too
10. I’ll give the book to him if he _B__ here next Sunday.
E 作discuss等动词的宾语时，用whether不
用if。
《if条件状语从句》课件
if条件状语从句的基本用法
1 表达假设
if条件状语从句常用于表达假设，描述可能发生的情况。
2 引导结果
if条件状语从句还可以引导结果，说明由于某种条件发生，造成了一种结果。
if条件状语从句和现在时态的连用
一般现在时
if条件状语从句与一般现在时连用，表示一种普 遍真实的情况。
现在进行时
if条件状语从句与现在进行时连用，表示正在发 生的动作或状态。
3
练习三
根据上下文补全句子：I will go to the party if I ______ an invitation.
if条件状语从句中的注意事项
1 逗号的使用
2 否定形式
当if条件状语从句位于主句之前时，两者之间 可以用逗号隔开。
if条件状语从句中使用否定形式时，主句的谓 语动词要变为肯定形式。
if条件状语从句的常见练习
1
练习一
完成以下句子：如果我明天有时间，我______。
2
练习二ቤተ መጻሕፍቲ ባይዱ
选择正确的if条件状语从句：______ it rains, we will stay at home.
《if条件状语从句》PPT 课件
欢迎来到《if条件状语从句》PPT课件！在本课程中，我们将探讨if条件状语 从句的定义、结构以及各种用法，让您轻松掌握这一重要语法知识点。
if条件状语从句的定义和结构
if条件状语从句是指描述某种情况下，另一种情况会发生的句子结构。它由一 个if引导，并包含一个主句和一个从句。
if条件状语从句和过去时态的连用
一般过去时
if条件状语从句与一般过去时连用，表示过去某个时 间或条件下的情况。
过去进行时
if引导的虚拟条件句ppt课件.ppt
if引导的虚拟条件句ppt课件.ppt1、虚拟语气------if引导的虚拟条件句虚拟语气(if条件句)Iftheworkingconditionsarenottoobad,Iwillacceptthejob.Ift heworkingconditionswerenottoobad,Iwouldacceptthejob.真实条件句：对现有事实的一种陈述，使用的是陈述语气〕---表达一种看法〔工作条件状况未知〕非真实条件句---虚拟语气〕表达一种假设〔与事实相反---工作条件已经很糟糕了〕If引导的虚拟条件句的三种类型带if的虚拟条件句省略if的虚拟条件句隐藏if的虚拟条件句Ⅰ、带if的虚拟条件句Ifsheinvitedme,Iwouldgototheparty.Ifshehadinvitedmeyest2、erday,Iwouldhavegonetotheparty.Ifsheshouldinvitemetomorrow, Iwouldgototheparty.与如今事实相反：if条件句用一般过去时〔动词be用were〕主句用would(should/could/might)+动词原形IamsorryIamverybusyjustnow.IfIhadtime,Iwouldcertainlygototh emovieswithyou.Ifyoucouldbeartheloneliness,youmightsucceed. Ifwehadn’tmadeadequatepreparations,thepartywouldn’thavebe ensosuccessful.The3、floodmighthavecausedgreatdamagetothepeople,ifwehadn’tbuilt somanydams.与过去事实相反：if条件句中用过去完成时主句用would〔should/could/might〕+have+过去分词。
if的用法总结及例句PPT
与“in case”的联系
in case可引导目的状语从句，相当于if引导的条件状语 从句。例如：“Take an umbrella in case it rains.”（ 带把伞以防下雨。）
熟练运用if在固定短语和句型中应用
“If only”句型
表示对现在或将来的虚拟假设， 通常用于表达遗憾或愿望。例如 ：“If only I had more time, I could finish the project.”（要 是我有更多的时间，我就能完成 这个项目了。）
典型例句
01
If it rains tomorrow, we will stay at home.（如果 明天下雨，我们就呆在家里。）
02
If I were you, I would take the job.（如果我是你 ，我就会接受这份工作。）
03
If he had known the answer, he would have told me.（如果他知道答案，他就会告诉我。）
功能
用于表达在某种条件下会产生的结果 或采取的行动。
结构特点
01
if从句+主句
if引导的条件状语从句通常位于 主句之前，由if引导，后面紧跟 主句。
时态呼应
02
03
虚拟语气
if从句中的时态通常与主句中的 时态相呼应，表达相应的假设条 件。
在if引导的虚拟条件句中，从句 和主句的时态往往采用虚拟语气 ，表达与事实相反的情况。
“As if/though”句 型
引导方式状语从句，表示比喻或 虚拟的情况。例如：“She speaks English as if she were a native speaker.”（她说英语就 像以英语为母语的人一样。）
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If I travelled in a spaceship, I would go to Mars.
14
If I went to Mars, I would meet a Martian.
Nice to meet you!
15
If I met a Martian, I wouldn’t understand him.
3
I miss the bus.
05/04/2020
4
If I miss the bus, I am late for school.
05/04/2020
5
If I am late for school, my teacher gets angry.
05/04/2020
6
If clause
Main clause
?
IfI aved
16
If I didn’t understand him, I would come back to the Earth.
17
If clause
Main clause
If + Past Perfect would/could/might + have + past
tense
participle
11
If clause If + Past Simple
Main clause would / could / might + verb
If I were an astronaut, I would travel in a spaceship.
12
If I were an astronaut, I would travel in a spaceship.
20
IIf I had gone to the beach, I would have made sand castles.
21
9
If I go to Buckingham Palace,
I can take a photo of the Royal Guard.
05/04/2020
10
If you go to London, you must look right before crossing a street
05/04/2020
If I had studied hard, I would have studied hard, you wouldn’t have failed your exam.
19
IIf you had passed your exam, you could have gone to the beach.
• If + Present tense will / can / may / must + verb
If I go to London, I will see the Big Ben.
7
If I go to London …
05/04/2020
8
I will see the Big Ben.
05/04/2020
ZERO FIRST SECOND THIRD
1
If clause If + Present simple
Main clause Present simple
If I am late for school, my teacher gets angry.
2
If I oversleep …
05/04/2020
If I travelled in a spaceship, I would go to Mars.
14
If I went to Mars, I would meet a Martian.
Nice to meet you!
15
If I met a Martian, I wouldn’t understand him.
3
I miss the bus.
05/04/2020
4
If I miss the bus, I am late for school.
05/04/2020
5
If I am late for school, my teacher gets angry.
05/04/2020
6
If clause
Main clause
?
IfI aved
16
If I didn’t understand him, I would come back to the Earth.
17
If clause
Main clause
If + Past Perfect would/could/might + have + past
tense
participle
11
If clause If + Past Simple
Main clause would / could / might + verb
If I were an astronaut, I would travel in a spaceship.
12
If I were an astronaut, I would travel in a spaceship.
20
IIf I had gone to the beach, I would have made sand castles.
21
9
If I go to Buckingham Palace,
I can take a photo of the Royal Guard.
05/04/2020
10
If you go to London, you must look right before crossing a street
05/04/2020
If I had studied hard, I would have studied hard, you wouldn’t have failed your exam.
19
IIf you had passed your exam, you could have gone to the beach.
• If + Present tense will / can / may / must + verb
If I go to London, I will see the Big Ben.
7
If I go to London …
05/04/2020
8
I will see the Big Ben.
05/04/2020
ZERO FIRST SECOND THIRD
1
If clause If + Present simple
Main clause Present simple
If I am late for school, my teacher gets angry.
2
If I oversleep …
05/04/2020