if only和only if的用法与区别
[转载]only的几种特殊用法词语辨析非谓语的常见误用情况
![[转载]only的几种特殊用法词语辨析非谓语的常见误用情况](https://img.taocdn.com/s3/m/17c3a60da66e58fafab069dc5022aaea998f411f.png)
由于自身的特点和复杂性，非谓语动词是较难掌握语法项目之一，也是各 类考题热点命题方向。非谓语动词内容很多，因此命题的知识点也有很多。各 类考题除了考查非谓语动词的基本功能外，还考查非谓语动词的形式变化以及 动词与非谓语动词的不同搭配等。 易错点回顾： 1. 下面短语中的to是介词，后面只能跟名词或动名词：
五、to作介词（后接名词、动名词）短语一览
be / get / become used to 习惯于 be given to 喜欢；癖好 be related to 与…有关系 be addicted to 沉溺于；对…上瘾 be opposed to 反对 devote oneself to献身于；专心于 be devoted to 致力于；忠诚于 be admitted to 被…录取；准进入 be reduced to 沦为
11. reduce sb to doing sth 使某人沦为做某事
12. give one’s life to doing sth 献身于做某事
13. give one’s mind to doing sth 专心做某事
14. have a dislike to doing sth 厌恶做某事
六、If only 为虚拟语气的一种，表示愿望或一个未实现的条件，多用于感叹 句，其主句常常省略。如：
If only she would marry me! 她要是能和我结婚该多好！ If only he had known about it! 他那时要是知道这件事该多好！ If only you could have been here earlier that day! 要是你那天再早点到这就好了。 If only there were forty-eighty hours in a day. 要是一天有48个小时就好了。
【语法】only的几种特殊用法
【语法】only的几种特殊用法——————摘自知米背单词官方论坛在学习英语的过程中，我们常遇到only与其它词或结构搭配来表达不同的意思，现将这些用法示例一、only引导的词组或句子放在句首作状语时，通常要用倒装结构。
如Only in this way can you solve the problem.只有通过这种方式你才能解决问题。
Only if you study hard can you pass the exam.只有努力学习才能通过考试。
Only then did I realize my mistake.只有那时我才意识到错了。
二、not only…(but also)出现在句首时，如果架连接的是两个句子，常用倒装。
如Not only did we lose all our money,but we also came close to losing our lives.我们不仅丢了钱，还差点把命丢了。
Not only did he speak correctly,but he also spoke easily.他不仅说得准确，而且说得很轻松。
三、only放在不定式前面，常表示不愉快或出乎人们的意料的结果。
如I went all the way to his home only to find hime out at a meeting.我径直到他家里去，不料发现他出去开会了。
I hurried to the post office only to find it closed.我匆忙赶到邮局，不料已经关门了。
She went home only to find her house burglarized.她回到家里，发现房子被盗了。
四、“too…to…”结构中，表示否定意思，但在“only too…to…”结构中，only too = very，表示肯定意思。
如The patient is too weak to walk.那个病人太虚弱了，走不动。
only的几个主要用法11
在学习英语的过程中，我们常遇到only与其它词或构造搭配来表达不同的意思，现将这些用法例如一、only引导的词组或句子放在句首作状语时，通常要用倒装构造。
如Only in this way can you solve the problem.只有通过这种方式你才能解决问题。
Only if you study hard can you pass the exam.只有努力学习才能通过考试。
Only then did I realize my mistake.只有那时我才意识到错了。
二、not only...(but also)出现在句首时，如果架连接的是两个句子，常用倒装。
如Not only did we lose all our money,but we also came close to losing our lives.我们不仅丢了钱，还差点把命丢了。
Not only did he speak correctly,but he also spoke easily.他不仅说得准确，而且说得很轻松。
三、only放在不定式前面，常表示不愉快或出乎人们的意料的结果。
如I went all the way to his home only to find him out at a meeting.我径直到他家里去，不料发现他出去开会了。
I hurried to the post office only to find it closed.我匆忙赶到邮局，不料已经关门了。
She went home only to find her house burglarized.她回到家里，发现房子被盗了。
四、“too...to...〞构造中，表示否认意思，但在“only too...to...〞构造中，only too = very，表示肯定意思。
如The patient is too weak to walk.那个病人太虚弱了，走不动。
only的几种特殊用法
在学习英语的过程中，我们常遇到only与其它词或结构搭配来表达不同的意思，现将这些⽤法⽰例如下：⼀、only引导的词组或句⼦放在句⾸作状语时，通常要⽤倒装结构。
如Only in this way can you solve the problem.只有通过这种⽅式你才能解决问题。
Only if you study hard can you pass the exam.只有努⼒学习才能通过考试。
Only then did I realize my mistake.只有那时我才意识到错了。
⼆、not only...(but also)出现在句⾸时，如果架连接的是两个句⼦，常⽤倒装。
如Not only did we lose all our money,but we also came close to losing our lives.我们不仅丢了钱，还差点把命丢了。
Not only did he speak correctly,but he also spoke easily.他不仅说得准确，⽽且说得很轻松。
三、only放在不定式前⾯，常表⽰不愉快或出乎⼈们的意料的结果。
如I went all the way to his home only to find hime out at a meeting.我径直到他家⾥去，不料发现他出去开会了。
I hurried to the post office only to find it closed.我匆忙赶到邮局，不料已经关门了。
She went home only to find her house burglarized.她回到家⾥，发现房⼦被盗了。
四、“too...to...”结构中，表⽰否定意思，但在“only too...to...”结构中，only too = very，表⽰肯定意思。
如The patient is too weak to walk.那个病⼈太虚弱了，⾛不动。
自考英语二(新版)原文 Unit 6 The Value of Money
Unit 6 The Value of MoneyA Famous Quote:Never spend your money before you have it.钱财未到手，绝不提前花。
–Thomas Jefferson——托马斯.杰斐逊Thomas Jefferson(1743-1826), the third President of the United States and primary author of the Declaration of Independence.Text A Teaching Children to Spend Pocket Money Wisely Pre-reading Questions:1. Recall and describe how your parents allocated pocket money to you and howyou spent it.回忆并描述过去你父母是如何给你分配零花钱，你又是怎么花的。
2. What influence does that way of giving pocket money have on kids financemanagement?家长给孩子零花钱的方式对于孩子的财务管理能力有什么影响？Unit 6 The Value of MoneyNew words1. stationery n. 文具同音词：stationary（静止的）2. fare n. 车费；船费；飞机票价（fair）3. lump sum n. 一次总付的钱款4. recess n. 课间休息，5. allocate v. 拨（给）；划（给）；分配（给）6. overspend v. 花钱过多；比（预计的）花得多；超支注意over- / out-的区别：overeat outeatoverdo outdooversleep outliveoverweight outshine7. opt v. 选择；挑选optionoptional8. constraint n. 限制；限定；约束9. budget v. 谨慎花钱；把…编入预算10. overindulge v. 过多地享用（尤指食物或饮料）11. short-sighted adj. 目光溜浅的；没有远见的12. mentality n. 心态；思想状况；思想方法13. sibling n. 兄；弟；姐；妹14. indulge v. 沉湎，沉迷，沉溺（于…）15. rationing n. 定量配给政策；配给制16. principle n. 观念；（行动、思想的）理由，信条同音词：principal 主要的，首要的17. unnecessarily adv. 没必要地18. differentiate v. 区分；区别；辨别differ different difference19. inculcate v. 反复灌输；谆谆教诲20. resist v. 忍住；抵挡resistant resistance21. temptation n. 引诱；诱惑22. scheme n. 计划；方案；体系；体制23. formation n. 组成；形成24. kindergarten n. 幼儿园25. monthly adj. 按月结算的；有效期为一个月的daily weekl y biweekl y monthly quarterl y yearly Phrases and Expressions1. on a daily basis 每日地2. result in 导致3. pay off 付清；偿清4. within one's means 量入为出5. stand…in good stead （需要时）对某人有用，对某人有利Teaching Children to Spend Pocket Money Wisely教孩子们理性地使用零花钱School-going children need pocket money for food, stationeryand bus fares. Parents give pocket money to their children in different ways. Some give a lump sum at the beginning of a month or a week. Others prefer to give pocket money on a daily b asis. The way in which pocket money is given affect s how money is spent or saved. On the other hand, the children's spending habits may affect how pocket money is given.正上学的孩子们需要零花钱来买吃的、买文具，还有支付公交费用。
only if的用法倒装句
only if的用法倒装句only if的用法倒装句是指在句中使用only if时，将if引导的从句置于句首，而将主句置于从句之后。
这种语法结构在英语中称为only if的倒装句。
only if的倒装句是一种特殊的语法结构，它具有一定的强调性，使得语句变得更加强调，从而更具有表达力。
在口语中，only if 的倒装句常常用来表示强烈的感情和重要的意义。
只有当句子中出现 only if 时，才能使用倒装句。
另外，如果句子中出现了疑问词或不定代词，则不能使用倒装句。
例如：Only if he agrees can we go.此句中的if he agrees 中的疑问词he 不能使用倒装句。
only if的倒装句的构成也非常简单，只要把only if 和后面的句子放在一起就可以了。
例如：If he agrees only then can we go.句中的if he agrees 和only then 就是only if的倒装句。
在英语口语中，可以使用only if来表达特殊的情绪和重要的意义。
例如：Only if you promise to come can I be happy.此句中的only if表示了发自内心的重要的愿望，也表明了句中的情绪。
在写作中，可以使用only if的倒装句来表达强烈的情绪和重要的观点，使文章具有更强烈的表达力。
例如：Only if all of us work together can the problem be solved.此句表达了一个强烈的观点，即只有大家共同努力，才能解决问题。
总之，only if的倒装句是一种特殊的语法结构，它可以在口语和书面语中使用，使句子具有强烈的表达力和重要的意义。
ifonly用法的虚拟语气
ifonly用法的虚拟语气
如果只有一种语法可以表示“如果…就好了”的话，那就是虚拟语气。
在英语中，虚拟语气可以使用“if only”这个短语来表达。
在这种情况下，“if only”表示的是一种希望或者遗憾的情感。
举个例子，假设你原本打算去旅行，但是由于某些原因不能去了，你可以说：“If only I could go on the trip.”这句话的意思是，“如果我能去旅行就好了。
”
除此之外，“if only”还可以表示对过去的遗憾。
例如，“If only I had studied harder, I would have passed the exam.”这句话的意思是，“如果我当时更努力学习，我就能通过考试了。
”
虚拟语气的使用需要注意的一点是，如果条件状语从句使用了过去式或过去完成式，那么主句中谓语动词需要使用
“would/could/should + 动词原形”的形式。
例如，“If only I had more time, I could finish the project.”这句话的意思是，“如果我有更多时间，我就能完成这个项目了。
”
总之，“if only”是表示虚拟语气的一种常用短语，它可以用来表达希望或者遗憾。
在使用的时候需要注意从句的时态，以及主句中谓语动词的形式。
if only用法归纳
if only用法归纳好嘞，以下是为您创作的关于“if only 用法归纳”的文案：咱今天就来好好唠唠“if only”这个短语的用法。
先来说说“if only”常见的第一种用法，它常用来表达强烈的愿望或遗憾，意思是“要是……就好了；但愿……”，而且后面接的句子要用虚拟语气。
比如说，“If only I were taller ”（要是我再高点儿就好了。
）这里用了 were，而不是 was，因为是虚拟语气嘛。
我想起之前教过的一个学生小明，他特别喜欢打篮球，可就是身高不太够，每次看到那些高个子同学在球场上轻松投篮，他就会嘟囔：“If only I were taller I could play basketball better” 那小眼神里满满的都是渴望和无奈，看得我都有点心疼他了。
再说说“if only”引导的虚拟语气中，对过去的虚拟。
要是想表达对过去事情的遗憾，就得用“if only ＋主语＋ had ＋过去分词”这个结构。
举个例子，“If only I had studied harder last term ”（要是我上学期学习再努力点就好了。
）就像我表妹，之前考试没考好，哭着跟我说：“If only I had reviewed all the lessons before the exam ”她那后悔的样子，真是让人又好气又好笑。
还有啊，如果是对将来的虚拟，那就得用“if only ＋主语＋would/could ＋动词原形”。
比如说，“If only he would come tomorrow ”（但愿他明天能来。
）我记得有一次和朋友约好出去玩，结果他临时有事来不了，我心里就想：“If only he could come as planned ”那失落感，别提了！另外，“if only”还能用来强调条件的重要性。
比如说，“If only you listen carefully, you will understand ”（只要你认真听，你就会明白。
虚拟语气
虚拟语气1. without1）当表示“若没有”时，如果谈论的是一种与事实相反的假设，要用虚拟语气，此时，和but for用法相同：Eg. Life would be quiter without the telephone.2）如果without谈论的只是一种普通的假设，并不强调与既定事实相反，则不必用虚拟语气：Eg. Can you see without your glasses. 如果不戴眼镜，你能看见吗？3）if it weren’t for与if it hadn’t been for这两个也是常见的虚拟句型，表示“若不是有，要不是有”，与but for和without同义：Eg. If it wasn’t for the children, we wouldn’t have anything to talk about.Were it not for this misfortune, he might never have been forced into the business of grinding out novels to support his family. 如果不是因为这一不幸变故，他可能永远不会被迫从事创作小说养家糊口。
注：一般，if it weren’t for用于谈论现在的情况，if it hadn’t been for用于谈论过去的情况，但有时if it weren’t for也可用于谈论过去的情况。
2. 常见的介词短语：in the absence of（如果没有），were it not for（要是没有），but that （假设……不）等：Eg. In the absence of gravitity, there would be no air around the earth.3. 虚拟语气用在would rather，had rather，would sooner（宁愿，宁可），had better，had best （最好），would have句型中，后面如果是动词，后接原形动词。
Only_if和if_only的用法区别
圣诞节英语作文一：Christmas Is ComingI like Christmas, it is just like our Spring Festival.Maybe the Spring Festival is much more important and interesting than Christmas, but I like Christmas Day better. Because we can spend time with our friends and classmates during Christmas. When it is snowy,Christmas becomes much more lovely, just like in fairytales. I can imagine I am in a fairytale, the girl who sold the matches is my friend, the ugly duck becoming more and more beautiful and so on.. What a beautiful place! So we can also call Christmas “S nowy Lovely Day.”On Christmas Day, shops are red and green. There are so many Christmas cards, Christmas hats, Christmas dolls and many colourful things. So shops look very beautiful. We can give a card or a doll to our friends and say “Merry Christmas.”By the way, I think studying can also become much more interesting.Christmas is coming, it also means a new year will come. Let’s study harder to welcome圣诞节英语作文二：Chritmas is the day that Jesus Christ was born. People in the world celebrate and worship this day in his honor. The santa claus will come out and send presents for children. Christmas cards and decorated trees are all over the place. The carolling of Christmas songs echo through the air. I am not a Chirstian, but I also enjoy the atmosphere of Chrismas. I wish everybody have a merry Chirismas.圣诞节英语作文三：The chinese spring festival and the western christmas-中国的春节和西方的圣诞节evely nation has its own folk festivals. Those festivals give people a chance to be away from their regular work and everyday worries to enjoy themselves and to develop kindship and fi'iendship. The spring festival is the chief holiday in china while christmas is the most important redletter day in the western world.the spring festival and christmas have much in common. Both are prepared hefiorehand to create a joyous atmosphere; both offer a family reunion with a square feast: and both satisfy the children with new clothes, lovely presents and delicious food. However, the chinese spring festival has no religious background while christmas has something to do with god and there is santa claus with white heard to bring children presents. The westerners send each other christmas cards for greetings while the chinese people pay a call on each other.nowadays, some of the chinese youth has begun to celebrate christmas, following the example of the westerners. Perhaps they do so just for fun and out of curiosity.圣诞节英语作文四：Christmas is one of the most important celebrations of the year for the western countries. It falls on the twenty- fifth of December and has the same importance as Chinese New Year to people with English backgrounds. The celebration is for the birth of Jesus Christ, who is the son of God in Christianity. Now days Christmas is no longer only celebrated by the Christians, but by most people from all over the world.On the twenty- fourth of December everyone gets excited for it’s the day before Christmas which is called Christmas Eve. The children are usually sent to bed early and are warned that “Santa Claus will only come and give you a present if you be good.”The younger kids actually believe that Santa will come down the chimney on the sleigh that’s pulled by his reindeers. Foodlike short bread and beer are prepared for Santa when he comes, however most times parents just eat them. Some children put socks and sacks up for the holding of the presents (that their parents put in).Rise and shine on Christmas morning! The children are always the first ones to wake up, some even do at four. Present wrappers everywhere! They look into their presents with a big smile on their face and oh dear….I hope no one’s disappointed. I feel sorry for anyone that got pink underwear. Children play while dinner is prepared by the adults. The Christmas dinner are usually eaten together by relatives. The tradition of Christmas pudding and roosters are usually eaten with deserts afterwards. The rest of the day is usually games and fun before the good days all come to an end.I wish everyone a Merry Christmas and a Happy New Year!!!。
- 1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。
Only if和if only的用法区别
一、only if
1. 在only if 这个短语中，副词only是中心词,而从属连接词if则只是用来连接从句的，因
此，它表示“只有„„(才)；只有在„„的时候，唯一的条件是„„”的意思。例如：
I told him he would succeed only if he tried hard. 我告诉他，只有努力才能成功。
2. only if 有时也写成only...if，表示唯一的条件，但是意思不变。例如：
I will only come home if you come with me. （= I will come home only if you come with me.） 只
有你跟我一起走，我才回家。
因此，根据上面的分析，课文中的句子我们也可以把它改成Yet they could get the blood only if
one of the frightened children would agree to give it. 这样，句子就比较容易理解，意思也就十
分清楚了：但是，只有这些受惊吓的孩子中有人自愿献血，他们才能够得到血。
二、if only
1. 在if only这个短语中，中心词是从属连接词if, 而副词only只是加强if的语气的，因此，
if only仅仅是if的一种强化形式，不仅能表达说话人的愿望，而且能表达条件。因此，它同
if一样，也能引出条件状语从句。
If only they were here now, we would be able to celebrate their wedding anniversary.如果他们现
在在这里，我们就能庆祝他们的结婚纪念日了。
2. if only常常用来表达强烈的愿望或遗憾，因此，主要用在虚拟语气中，用以表达强烈的愿
望或非真实条件。常被译为“但愿”、“要是„„该多好啊”等。例如：
If only she could have lived a little longer. 要是她能活得再长一些，那该多好啊！
3. if only从句在大多数情况下用作虚拟条件句，但是偶尔也有用在真实条件句的情况。例如：
He will succeed if only he does his best. 只要他竭尽全力，他就会成功。
4. if only有时也可以写成if... only。例如：
If she would only come! 但愿他能来。
三、从上面的分析，我们还可以看出only if和 if only这两个短语都可以用来引导条件从句，
表示主句所需要的“条件”，但是两者有差异，主要表现在说话人的语义意图等方面。
1. only if 引起的条件状语从句，是一个对“条件”限制更严的“限制性条件状语从句”，表
示“只有„„(才) ；只有在„„的时候；唯一的条件是„„”的意思；与if引起的一般条
件句相比，它有一种增强主句语势的作用。例如：
Only if the case is urgent should you call out the doctor in the middle of the night. 只有患者情况
紧急时，你才可以在半夜叫医生看病。
2. if only引导的条件句，通常用来表示说话人对某事所寄予的某种强烈愿望，相当于as long
as。它可以独立使用，用来表示由于客观条件限制，为某事不大可能或完全不可能实现而感
到惋惜或遗憾的复杂心情，常用虚拟语气。例如：
If only I were as clever as you！要是我像你一样聪明该多好啊！