if真实条件句ppt
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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-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真实条件句PPT课件
方法二：
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)。
.
10
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 ( it is ) possible
without referring to the books.
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.
.
9
If (it is) necessary , I’ll explain to you again.
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.
less candy.
.
3
Lቤተ መጻሕፍቲ ባይዱcture Twelve
Grammar
if 引导真实条件句中
主谓语省略
.
4
If he is in trouble, he will turn to police for help.
If in trouble, he will turn to police for help.
《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
2024版if条件句教学课件pptx
if条件句教学课件pptx目录•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PART01引言帮助学生掌握if条件句的基本用法和规则提高学生的语言运用能力和表达能力培养学生的逻辑思维和判断能力目的和背景if 条件句在日常生活和商务场合中的应用实例if 条件句的时态和语态变化if 条件句的基本概念和用法if 条件句的省略和倒装if 条件句的练习题和答案解析课件内容概述0103020405PART02if条件句基本概念01if条件句是一种根据特定条件执行不同操作的编程语句。
02它允许程序根据条件的结果选择不同的执行路径。
条件表达式是一个返回布尔值的表达式，用于判断条件是否满足。
如果条件满足，则执行if 后面的代码块；否则，可以选择执行else后面的代码块（如果有）。
if条件句通常由if关键字、条件表达式和冒号组成，后面跟着要执行的代码块。
03多分支if-elif-else 条件句包含一个if 语句、一个或多个elif 语句和一个else 语句，根据条件的真假依次判断并执行相应的代码块。
01单分支if 条件句只有一个if 语句和一个代码块，根据条件的真假执行相应的操作。
02双分支if-else 条件句包含一个if 语句和一个else 语句，根据条件的真假选择不同的代码块执行。
PART03if条件句在编程中的应用使用if 条件句可以根据不同条件执行不同代码块，实现程序分支。
分支结构循环结构异常处理结合循环语句，通过if 条件句控制循环执行的条件和次数。
在try-except 语句块中，使用if 条件句对异常情况进行判断和处理。
030201控制程序流程使用“==”操作符判断两个值是否相等。
等于判断使用“!=”操作符判断两个值是否不相等。
不等于判断使用“>”、“<”操作符比较两个值的大小关系。
大于、小于判断使用“>=”、“<=”操作符比较两个值的大小关系，并包含等于的情况。
if 条件状语-课件
Homework . Finish
the exercises in the
workbook.
You may borrow my books as long as you keep it clean. 只要你保持书的清洁，你就可以借……
时候
You will fail to arrive there in time unless you start earlier． 如果你不早点动身，你就不能及时赶到那儿。 Unless bad weather stops me，I go for a walk every morning． 除非天气不好，我每天早晨都要去散步。 I won‘t loan you unless you are in extreme need of money． 若不是你急需用钱，我不会借钱给你的。
1.考连词---做题思路：
分析试题特点及做题思路： 分析试题特点及做题思路：
分析句子--- 判断关系--- 选择正确的连词： 1.You won’t get nervous ___you do enough exercise. A.if, B, unless C, whether 2. _______ you hurry up, you will miss the early bus. A. if, B, unless C, whether
2.考时态---做题思路：
认字-- 判断语境提供的时态特点--选择正确的时态
1.If It______ (rain) tomorrow, I______(stay) at home.
A. rain ,stay B. rains, stay
C. rains, will stay
D. rain ,will stay
if引导条件状语从句的PPT课件
5.Had I known about the computer program, a huge amount of time and energy_____.
A. would have been saved B. had been saved C. will be saved D. was saved
如果条件从句中有were/had/should时，可以 把if省略，把这几个词放到主句之前，构成主 谓倒装。 ➢Were I you (=If I were you ),I would not do it.
➢Had I the time (=If I had the time),I would go.
6.If we ____ the other road, we might have arrived here in time for the meeting.
A. take B. had taken C. took D. have taken
含蓄虚拟条件句 without…（没有…),if only（要是…就 是好了），but for(要不是)，otherwise ，等等
If 引导的条件状语从句
1.真实条件句 表示的情况有可能发生，用陈述语气。 I will not go to the party if I am not invited.
2.虚拟条件句 表示的情况不可能发生或者发生的可能很 小。 下面我们重点讲虚拟条件句
时间
从句
主句
Байду номын сангаас与现在事实相反
过去式
（be 一般用were）
should would could might
+动词原形
与过去事实相反
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。）
英语语法PPT课件-if条件句
IIf I had gone to the beach, I would have made sand castles.
If you go to London, you must look right before crossing a street
If clause If + Past Simple
Main clause would / could / might + verb
If I were an astronaut, I would travel in a spaceship.
If I met a Martian, I wouldn’t understand him.
?
IfI aved
If I didn’t understand him, I would come back to the Earth.
If clause
Main clause
If + Past Perfeห้องสมุดไป่ตู้t would/could/might + have + past
If I were an astronaut, I would travel in a spaceship.
If I travelled in a spaceship, I would go to Mars.
If I went to Mars, I would meet a Martian.
Nice to meet you!
tense
participle
If I had studied hard, I would have passed my exams.
IIf you had studied hard, you wouldn’t have failed your exam.
If 引导的条件状语从句(共17张PPT)
思考
I don’t know if he _w_il_l _co_m_e_(come)to our party tonight. If he _c_om__es_(come), I will tell you.
结论: 当if作“__如__果__”_讲时，用“主将从现”； 当if作“__是__否__”讲时，根据句意和时态选择合适的时态。
get tired? 7. Where (_w__il_l_/ do/does) they live if they (will miss/ _m_i_s_s_/ misses) the
bus? 8.If you_(_fe__e_l / will feel) hungry, you (s_h__o_u_l_d / must) eat something.
if条件状语从句的意义：表示在某条件下，某事很可能 发生。
语法规则： 1.条件句,放在前,逗号要放句中间； 2.主将从现
If you don’t stay at home, what will you do ? where will you go?
If you don’t stay at home, I __w_i_l_l _g_o_ shopping.
If hazy weather comes,
we will stay at home. /don't go out. /we should drink more water. ...
If 引导的条件状语从句
Learning objectives（学习目标）:
1.Master the sstrtruucctuturreeaanndduussee of conditional
TIfhahta’szynowt eeantohuegrhc.omes,
《If条件句的用法》课件
Leabharlann 3 基本结构4 分类
If条件句由一个条件从句和一个结果从句组成， 条件从句通常以If开头。
If条件句可以根据情况的真实性和虚拟性来分 成不同种类。
零条件句
零条件句表示一种普遍规律或真理，条件从句中的谓语动词使用一般现在时，结果从句中的谓语动词使用一般 现在时。
条件从句 When it rains, 如果下雨，
《If条件句的用法》PPT 课件
在这个PPT课件中，我们将探讨If条件句的用法，并提供实例分析，帮助您更 好地理解和运用这一语法结构。
概述
1 什么是If条件句?
2 为什么重要?
If条件句是一种表达假设情况的语法结构，它 包含一个条件和一个结果。
If条件句是英语中常见的句型之一，掌握它将 帮助提高沟通能力和语言表达的准确度。
第三种条件句
结构:
If + 过去完成时，主将从现。
示例:
If he had finished his homework, he would be playing video games now.
常见错误
在使用If条件句时，容易犯一些常见错误，例如混淆条件从句和结果从句的时态，使用错误的条件从句类型等。
1 错误的例子:
If I will have time, I will help you.
2 正确的例子:
If I have time, I will help you.
实例分析
商务会议
如果我们成功签订合同，我们的 利润将大幅增加。
旅行目的地
如果我们选择去沙滩度假，我们 将可以享受阳光和海浪。
工作面试
如果我能展示我的技能和经验， 我有机会得到这份工作。
If条件句由一个条件从句和一个结果从句组成， 条件从句通常以If开头。
If条件句可以根据情况的真实性和虚拟性来分 成不同种类。
零条件句
零条件句表示一种普遍规律或真理，条件从句中的谓语动词使用一般现在时，结果从句中的谓语动词使用一般 现在时。
条件从句 When it rains, 如果下雨，
《If条件句的用法》PPT 课件
在这个PPT课件中，我们将探讨If条件句的用法，并提供实例分析，帮助您更 好地理解和运用这一语法结构。
概述
1 什么是If条件句?
2 为什么重要?
If条件句是一种表达假设情况的语法结构，它 包含一个条件和一个结果。
If条件句是英语中常见的句型之一，掌握它将 帮助提高沟通能力和语言表达的准确度。
第三种条件句
结构:
If + 过去完成时，主将从现。
示例:
If he had finished his homework, he would be playing video games now.
常见错误
在使用If条件句时，容易犯一些常见错误，例如混淆条件从句和结果从句的时态，使用错误的条件从句类型等。
1 错误的例子:
If I will have time, I will help you.
2 正确的例子:
If I have time, I will help you.
实例分析
商务会议
如果我们成功签订合同，我们的 利润将大幅增加。
旅行目的地
如果我们选择去沙滩度假，我们 将可以享受阳光和海浪。
工作面试
如果我能展示我的技能和经验， 我有机会得到这份工作。
if_条件状语从句PPT课件
If I get up too late, I will go to school by bus. 如果我起床太迟了，我会坐公交车去上学。 If you walk to school , you will be more healthy. 如果你走路去上学，你会更健康。
If everyone obeys the traffic rules, the roads will be safer. 如果人人都遵守交通规则，道路 会更加安全。
10
结束语
当你尽了自己的最大努力时，失败也是伟大的， 所以不要放弃，坚持就是正确的。
When You Do Your Best, Failure Is Great, So Don'T Give Up, Stick To The End
演讲人：XXXXXX 时 间：XX年XX月XX日
Translation
1 如果她早点儿起床，就有时间在家里吃餐。 2 如果你参加聚会，你将会过得很开心。 3 如果明天下雨，我们将不去野餐。 4 如果你经常听英文歌，你将会喜欢英语。
写在最后
成功的基础在于好的学习习惯
The foundation of success lies in good habits
If Adverbial Clauses of Condition If 引导的条件状语从句
What will happen if you go to school late ?
If I go to school late, I will feel nervous
If I get up too late,
Drills/exercise：
1I。f s如he果_她g_e_早t_s点_u儿_p_起_床a l，itt就le有e时ar间lie在r,家sh里e’吃l早l h餐ave time to eat breakfast at home. 2。如果你参加聚会，你将会过得很开心。 If you_jo_i_n_ the party ,you__w_i_ll_h_a_ve__ a great time. 3。如果明天下雨，我们将不去野餐 If it r_a_in_s_tomorrow, we _w_o_n’__t_g_ofor a picnic. 4。如果你经常听英文歌，你将会喜欢英语 If you often _l_is_te_n_t_o_English songs, you_w_i_ll _lik_e_English.
If everyone obeys the traffic rules, the roads will be safer. 如果人人都遵守交通规则，道路 会更加安全。
10
结束语
当你尽了自己的最大努力时，失败也是伟大的， 所以不要放弃，坚持就是正确的。
When You Do Your Best, Failure Is Great, So Don'T Give Up, Stick To The End
演讲人：XXXXXX 时 间：XX年XX月XX日
Translation
1 如果她早点儿起床，就有时间在家里吃餐。 2 如果你参加聚会，你将会过得很开心。 3 如果明天下雨，我们将不去野餐。 4 如果你经常听英文歌，你将会喜欢英语。
写在最后
成功的基础在于好的学习习惯
The foundation of success lies in good habits
If Adverbial Clauses of Condition If 引导的条件状语从句
What will happen if you go to school late ?
If I go to school late, I will feel nervous
If I get up too late,
Drills/exercise：
1I。f s如he果_她g_e_早t_s点_u儿_p_起_床a l，itt就le有e时ar间lie在r,家sh里e’吃l早l h餐ave time to eat breakfast at home. 2。如果你参加聚会，你将会过得很开心。 If you_jo_i_n_ the party ,you__w_i_ll_h_a_ve__ a great time. 3。如果明天下雨，我们将不去野餐 If it r_a_in_s_tomorrow, we _w_o_n’__t_g_ofor a picnic. 4。如果你经常听英文歌，你将会喜欢英语 If you often _l_is_te_n_t_o_English songs, you_w_i_ll _lik_e_English.
if条件状语从句-课件(共31张PPT)
hard-working
get good grades
If she is hard-working,
she will get good grades.
Look and say
sunny this Sunday
go fishing .
If it is sunny this Sunday, I’ll go fishing .
• 读下列例句，试着自己总结if 的用法：
• 1. If you heat metal, it melts. • 如果把金属加热，它就会融化。 • 2.Water turns into ice if you cool it. • 如果你冷却水，它就会变成冰。 • 3.If you stand in the rain, you get wet.
A if; Whether B whether; Whether
C if; That D if ; If
3. Please tell her my telephone number if she _____ (want) to know.
wants
4. Will you come and stay with us for a while if you
“如果”。
If 引导的宾语从句可以用将来时，意思为“是
否”。
如果
Betty will visit the History Museum if it __d_o_e_s_n_’_t_r_ai_n_ (rain) tomorrow.
Ben wants to know if it____w_il_l b_e____ (be) fine tomorrow.
P105 B
• William has five problems • Give him some advice from column A and B
get good grades
If she is hard-working,
she will get good grades.
Look and say
sunny this Sunday
go fishing .
If it is sunny this Sunday, I’ll go fishing .
• 读下列例句，试着自己总结if 的用法：
• 1. If you heat metal, it melts. • 如果把金属加热，它就会融化。 • 2.Water turns into ice if you cool it. • 如果你冷却水，它就会变成冰。 • 3.If you stand in the rain, you get wet.
A if; Whether B whether; Whether
C if; That D if ; If
3. Please tell her my telephone number if she _____ (want) to know.
wants
4. Will you come and stay with us for a while if you
“如果”。
If 引导的宾语从句可以用将来时，意思为“是
否”。
如果
Betty will visit the History Museum if it __d_o_e_s_n_’_t_r_ai_n_ (rain) tomorrow.
Ben wants to know if it____w_il_l b_e____ (be) fine tomorrow.
P105 B
• William has five problems • Give him some advice from column A and B
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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.
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。
-
Have a try
1.If you are studying English , you must pay attention.
2.If two rivals meet , the strongminded one will win.
-
Have a try
1.除非你确立了目标 ，否则你就会失去方向。 Unless you set goals, you will lose your
way. 2. 如果你不快点，你就见不到Eason。 Unless you hurry up, you won’t see Eason.
-
主谓语省略
If you have finished dinner, I’ll ask the waiter for the bill.
-
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
-
• 如果你拉猫的尾巴，它就会抓(scratch)你。 If you pull the cat’s 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
do something. 3.如果明天天气好，我们就去划船。 If ( it is) fine tomorrow , we will go boating.
-
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.
-
unless引导真实条件句
• We can’t watch the film unless we buy tickets. We can’t watch the film if we don’t buy tickets.
• We will miss the film unless we hurry up. We will miss the film if we don’t hurry up.
If Eason is not invited, he won’t come to the party.
Unless Eason is invited, he won’t come to the party.
-
unless= if not (除非…否则，如果不)
1. 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.
3.If he is free , he will go with us. 4.If you want to have happiness , you
will get health , knowledge and virtue.
-
1.如果冰被加热，它就会变成水。 If heated, the ice will turn to water.
If you are offered help, you must never forget to say Thank you.
If offered help, you must never forget to say Thank you.
If (you are) in Rome , you must do as Romans do. 主句，从句主语相同
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.
-
If (it is) necessary , I’ll explain to you again.
less candy.
-
Lecture Twelve
Grammar
if 引导真实条件句中
主谓语省略
-
If he is in trouble, he will turn to police for help.
If in trouble, he will turn to police for help.
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 driving, you must drive with concentration.
-
If it is necessary, he will turn to police for help.
方法二： 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)。
-
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 ( it is ) possible without referring to the books. 2.如果有必要，你可以帮我们做点事。 If ( it is ) necessary , you can help us to
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.
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。
-
Have a try
1.If you are studying English , you must pay attention.
2.If two rivals meet , the strongminded one will win.
-
Have a try
1.除非你确立了目标 ，否则你就会失去方向。 Unless you set goals, you will lose your
way. 2. 如果你不快点，你就见不到Eason。 Unless you hurry up, you won’t see Eason.
-
主谓语省略
If you have finished dinner, I’ll ask the waiter for the bill.
-
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
-
• 如果你拉猫的尾巴，它就会抓(scratch)你。 If you pull the cat’s 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
do something. 3.如果明天天气好，我们就去划船。 If ( it is) fine tomorrow , we will go boating.
-
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.
-
unless引导真实条件句
• We can’t watch the film unless we buy tickets. We can’t watch the film if we don’t buy tickets.
• We will miss the film unless we hurry up. We will miss the film if we don’t hurry up.
If Eason is not invited, he won’t come to the party.
Unless Eason is invited, he won’t come to the party.
-
unless= if not (除非…否则，如果不)
1. 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.
3.If he is free , he will go with us. 4.If you want to have happiness , you
will get health , knowledge and virtue.
-
1.如果冰被加热，它就会变成水。 If heated, the ice will turn to water.
If you are offered help, you must never forget to say Thank you.
If offered help, you must never forget to say Thank you.
If (you are) in Rome , you must do as Romans do. 主句，从句主语相同
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.
-
If (it is) necessary , I’ll explain to you again.
less candy.
-
Lecture Twelve
Grammar
if 引导真实条件句中
主谓语省略
-
If he is in trouble, he will turn to police for help.
If in trouble, he will turn to police for help.
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 driving, you must drive with concentration.
-
If it is necessary, he will turn to police for help.
方法二： 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)。
-
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 ( it is ) possible without referring to the books. 2.如果有必要，你可以帮我们做点事。 If ( it is ) necessary , you can help us to