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only if与Only when的区别?

2023-07-08 14:38:30
TAG: only if ly he when
共1条回复
Chen

Only if 和 Only when 都是英语中的连词,它们在含义和用法上有所不同。

Only if 的含义是“只有在某种情况下才会发生或实现某事”,它的语法结构通常是:only if + 条件子句 + 主句。其中条件子句是必要条件,只有当条件满足时,主句才能成立。

例如:

  • Only if you study hard, will you pass the exam.(只有你努力学习,你才能通过考试。)

  • He will come only if you invite him.(只有你邀请他,他才会来。)

  • Only when 的含义是“只有在某种特定的时间、条件或情况下才会发生或实现某事”,它的语法结构通常是:only when + 特定的时间、条件或情况 + 主句。其中特定的时间、条件或情况是必要条件,只有在满足这些条件时,主句才能成立。

    例如:

  • Only when the sun goes down, can we see the stars.(只有太阳落山后,我们才能看到星星。)

  • You can leave the room only when you finish your work.(只有当你完成工作时,才能离开房间。)

  • 下表将对比only if和only when的语法、含义和用法:

only if

综上所述,只有在理解only if和only when的含义和用法的基础上,才能正确地使用它们。在实际运用时,我们可以根据语境选择合适的连词。

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onlyif是什么意思?

用法:only if表示"只有...才..."。当only if放在句首时,应该用倒装句型。所谓倒装句型,就是将句子中的"助动词"提前。读音:英 [u02c8u0259unli if] 美 [u02c8onli u026af] 解释:除非;只要…就;只有,只有当…1.I"ll do that, but only if we set a few rules. 我可以干,但我们得定几条规矩。2.The placebo effect can be understood only if we acknowledge the unity of mind and body.只有我们承认身心一体,安慰剂效果才能被理解。3.The lawyer is paid only if he wins 只有官司赢了才支付律师费。4.You can make progress only if you are modest. 惟虚心乃能进步。5.Political attacks work only if they find an echo with voters. 政治攻击只有在选民中引起共鸣才会有作用。6.The meat market can continue only if it is radically overhauled to conform with strict Europeanstandards. 肉类市场只有经过彻底的大检查,严格遵守欧洲标准,才能继续营业。7.Syria will attend only if the negotiations deal with issues of substance. 只有在谈判涉及重大问题时叙利亚才会参加。
2023-07-08 13:43:391

only if中文是什么意思

只要……就;只是在……的时候;只有
2023-07-08 13:43:472

only if 是什么意思

基本解释是“只要……就;只是在……的时候”。但还有其他的比如“也许只有”“只要”“决不…除非…”
2023-07-08 13:43:556

if only&only if有什么区别?

一、if only的用法。if only后面跟的是虚拟语气的句子,表示与事实相反的假设。If only I had more money, I could buy some new clothes. 要是我有更多的钱,我可以买些新衣服。If only he had arrived in time. 要是他能及时赶到就好了。If only I had known it, I wouldn"t have troubled him. 要是我知道,我就不会麻烦他了。If only that photograph weren"t missing. 要是那张照片没丢失该多好。二、only if的用法。only if后面跟条件状语从句,用陈述语气,后面用部分倒装句,be动词、助动词和情态动词放在主语之前,表示一种充分非必要条件,意思是只要。Only if you pass the entrance exam and become a college student, will I accept you as a friend.只要你通过高考,成为大学生,我就会认你为朋友。Only if we persist in carrying out the open door policy, will we achieve greater success in every field.只要我们坚持改革开放,我们就能在各个方面取得更大的成就。
2023-07-08 13:44:117

Only if和On condition that有什么不一样

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2023-07-08 13:44:324

if only 和only if 的区别

only if只要……;引导用陈述语气的真实条件句 Only if you study hard,you will have a good future. if only 但愿……,要是……就好。常引导虚拟语气的条件句或感叹句。 If only I can meet her again.但愿 If I were a bird.但愿 *^_^*但if only 有时候也可以引导条件句,作“只要”讲
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If only和only if怎么翻译,有啥区别?

if only....要是.....多好!If only I had known you then," he said wistfully. “要是我那时候认识你就好了,”他伤感地说only if...只要…就;只有,只有当…;除非You can make progress only if you are modest. 惟虚心乃能进步。
2023-07-08 13:45:045

怎么理解only if?

理解成除非,翻译成除非我能找到留下的理由,说明他要走
2023-07-08 13:45:445

if only 和only if 什么意思?

if only基本翻译只要;要是多好only if基本翻译只要就;只是在的时候网络释义Only If:唯有 | 除非 | 也许只有
2023-07-08 13:45:595

only if的用法及例句

only if的意思是:只有当;只要;除非,用于引导条件状语从句。only if引导的条件状语从句,一般不用进行时态,因为要跟主句一致。 Only if的用法 1、在only if 中,副词only是中心词,而从属连接词if只用来连接从句,因此,它表示“只有……(才);只有在……的时候,唯一的条件是……”的意思。 2、only if 有时也写成only…if,表示唯一的条件,但是意思不变。 例句: You can make progress only if you are modest. 惟虚心乃能进步。 Political attacks work only if they find an echo with voters. 政治攻击只有在选民中引起共鸣才会有作用。 3、Only if 条件从句在前,中间无逗号时主句要倒装。 例句: Only if a teacher has given permission is a student allowed to enter this room. 只有得到教师的允许,学生才可以进这间屋。 Only if presented in this way can your idea get over to the audience. 只有用这样的方式提出来,你的意思才能使听从明白。 4、若置于句首的only if不强调“唯一性”或“排他性”,比如当其中的only表示just或as recently as等意思时,此时其后的句子则不用倒装。 例句: The company will succeed only if it have sufficient backing. 只有当该公司获得足够的资助,它才会成功。 I can buy the house only if a mortgage for 2000 dollars is available. 只有拿到两千美元的抵押贷款,我才买得起那栋房子。
2023-07-08 13:46:261

only if 和if only是一个虚拟一个倒装吗?

都应该是的吧
2023-07-08 13:47:052

Only if 在句首 后面一定要倒装吗

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only if 是什么意思,有哪些用法?

只有...才...一般要用虚拟语气
2023-07-08 13:47:223

Only if 在句首 后面一定要倒装吗

only放在句首,且修饰状语时就必须倒装主句。only if明显是only修饰条件状语从句,当然要倒装。例如Only if you know how to do it, can you do it well.
2023-07-08 13:47:452

onlyif和only的区别

词意或词性方面。1、词意方面。onlyif表示强调,表示唯一条件,而only是只有,是中心词。2、词性方面。onlyif意思是仅仅如果,用于引导条件状语从句,而only则只是副词。
2023-07-08 13:47:581

only if引导的从句时态有什么要注意的

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2023-07-08 13:48:061

only if 的用法 倒装

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if是只有才的意思吗?

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2023-07-08 13:48:311

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2023-07-08 13:48:461

关于only if的倒装,

only在句首要倒装的情况 Only in this way,can you learn English well. Only after being asked three times did he come to the meeting. 如果句子为主从复合句,则主句倒装,从句不倒装 Only when he is seriously ill,does he ever stay in bed. only if 的倒装情况和only 一样的哈
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only if引导的从句时态有什么要注意的

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only if与ifonly区别?

only if表示"只有";if only则表示"如果……就好了"。If only也可用于陈述语气。 I wake up only if the alarm clock rings. 只有闹钟响了,我才会醒。 If only the alarm clock had rung. 当时闹钟响了,就好了。 If only he comes early. 但愿他早点回来。辨析only if 与 if only only与if这两个单词随意组合,可以组成两个意义相近,但用法不尽相同的短语only if与if only。现将它们的具体用法辨析如下: 一、only if意为“only on the condition that, as long as”,“只要;假如”。它用于陈述事实或必要的条件,比if所表达的语气更强烈。 You"ll pass this course only if you study. 只要你学,你就会通过这门课。 Children may enter the club only if they are accompanied by adults. 只要孩子们有大人陪同就可以参加俱乐部。 The students at the university can take up part-time job only if it doesn"t interfere with their studies. 只要不影响学业,这所大学的学生可以从事兼职工作。 二、if only则有两种含义。第一种含义与only if近似,意为“as long as”,“只要”。例如: If only it clears up, we"ll go. 只要天一放晴,我们就去。 第二种则是“expressing a wish or assumption”, “但愿;如果……就好了”。它用来表达一个不可能实现的愿望或假设,句子要用虚拟语气。例如: If only she would come!要是她能来就好了! If only you had told me you had a spare ticket for the show. 如果你告诉我,你多了一张演出票就好了。 If only you had worked with greater care!你要是工作更仔细一些该多好!如果有帮到您 请给予好评 如果还有问题 请重新提问哦 谢谢拉#^_^#祝您愉快
2023-07-08 13:49:302

only if的用法?

onlyif是“假如如果"的意思,在这是虚拟语气,在英语中很多表示虚拟的句子通常用过去式表达,表示与事实相违
2023-07-08 13:49:581

only if 倒装问题。

a lasting peace would be established in this region only if both sides accept the agreement
2023-07-08 13:50:187

only if引导什么状语从句 放在句首时需要注意什么?

条件状语从句:The class I teach is available only if there are enough students who will enroll for it.only if "只有......",引导条件状语从句,放句首时,主句部分倒装。如:Only if you work hard, can you make great accomplishments.你只有努力工作,才能取得大的成就。
2023-07-08 13:50:352

only if 和if only的用法区别?

only if和if only用法的区别为:一、指代不同1、only if:只有当。2、if only:要是…多好。二、侧重点不同1、only if:副词only是中心词,而从属连接词if则只是用来连接从句的。2、if only:中心词是从属连接词if,而副词only 只是加强if的语气的。三、引证用法不同1、only if:only用作形容词表示“唯一的,仅有的”,可修饰单数名词,也可修饰复数名词。前面常加定冠词the或形容词性物主代词。2、if only:if作为从属连词,可引导条件状语从句、让步状语从句和名词从句。
2023-07-08 13:50:431

只有才的英语是什么?

只有才的英语only if。在only if中,副词only是中心词,而从属连接词if只用来连接从句,因此,它表示“只有……(才);只有在……的时候,唯一的条件是……”的意思。例句:You can make progress only if you are modest.惟虚心乃能进步。英语if的用法1、(表示条件)如果,主句用将来时,if从句用现在时表示将来He will come if you invite him.如果你请他,他会来的.2.(表示虚拟)假如,要是时态:可以表示过去,现在和将来的情况.它的基本特点是时态退后.a、同现在事实相反的假设.句型:条件从句主句一般过去时should( would) +动词原形If they were here,they would help you.b.表示于过去事实相反的假设.句型:条件从句主句过去完成时should(would) have+过去分词If she had worked harder,she would have succeeded.
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only if怎么用啊

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only if倒装用法

部分倒装,把助动词或者情态动词提到主语前onlyifcanirealizemydream
2023-07-08 13:51:222

只有努力才会成功only if英语

答案:will you succeed 解析:only位于句首其后接副词、介词短语或状语从句时其后的句子该使用部分倒装.本题中only后面接的是if引导的条件状语从句,故后面的主句使用部分倒装;又根据"主将从现"这一语法知识可知后面的主句中需要将表将来时态的情态动词will提到主语you的前面.综上,本题答案为:will you succeed.
2023-07-08 13:51:301

only if, only when,unless 的用法和区别?

only if:要是。。。就好了,表示虚拟only when:只有当。。。。表示条件unless:除非。。。表示唯一的选择
2023-07-08 13:51:382

英语如何区分only if,if only,if not,what if

1,only if 只要...2,if only 要是...多好.表示一种愿望 There is so much more I could do if only I have time.3, if not 如果不是4,what if 如果...那会怎么样?
2023-07-08 13:51:462

only的倒装怎么用?

Only by combining theory with practice can you make progress
2023-07-08 13:51:545

only if,unless用法,区别是什么?

only if (用于句首,后接从句主谓倒装)只要;只有conj.只有当(只是在 ...的时候)例句:Only if I get a job will I have enough money to go to school这两个完全不同,那需要区别?unless===if notONLY if===only whenOnly if意为只有当 ......例:Only if you study hard can you get good grades.一般后面的主句用倒装,中间不隔开。unless是除非的意思例:I won"t go to the party unless invited..我只有找到了工作才有足够的钱上学.I can buy the house only if ...
2023-07-08 13:52:281

“if only” 和“only if"的用法和区别是什么?

only if (用于句首,后接从句主谓倒装)只要;只有conj.只有当(只是在 ...的时候)例句:Only if I get a job will I have enough money to go to school这两个完全不同,那需要区别?unless===if notONLY if===only whenOnly if意为只有当 ......例:Only if you study hard can you get good grades.一般后面的主句用倒装,中间不隔开。unless是除非的意思例:I won"t go to the party unless invited..我只有找到了工作才有足够的钱上学.I can buy the house only if ...
2023-07-08 13:52:371

only if的用法有哪些

only if表示"只有...才..."。当only if放在句首时,应该用倒装句型。所谓倒装句型,就是将句子中的"助动词"提前。 only if的基本用法: only if:conj.只有当 1、在only if 中,副词only是中心词,而从属连接词if只用来连接从句,因此,它表示“只有……(才);只有在……的时候,唯一的条件是……”的意思。 2、only if 有时也写成only…if,表示唯一的条件,但是意思不变。 例句: 1、You can make progress only if you are modest. 惟虚心乃能进步。 2、Political attacks work only if they find an echo with voters. 政治攻击只有在选民中引起共鸣才会有作用。 Only if的倒装用法 Only if 条件从句在前,中间无逗号时主句要倒装。 例句: Only if I get a job will I have enough money to go to school. 我只有找到了工作才有足够的钱上学。 Only if a teacher has given permission is a student allowed to enter this room. 只有得到教师的允许,学生才可以进这间屋。 Only if presented in this way can your idea get over to the audience. 只有用这样的方式提出来,你的意思才能使听从明白。 若置于句首的only if不强调“唯一性”或“排他性”,比如当其中的only表示just或as recently as等意思时,此时其后的句子则不用倒装。 例句: Our prices are in force only if you order by return mail. 我方价格仅以你方速复我订货,才有效。 The company will succeed only if it have sufficient backing. 只有当该公司获得足够的资助,它才会成功。 I can buy the house only if a mortgage for 2000 dollars is available. 只有拿到两千美元的抵押贷款,我才买得起那栋房子。
2023-07-08 13:52:541

only if 和 if only 有什么区别

Only if只有if only但愿
2023-07-08 13:53:035

Only if的用法是什么?

意思是:只有当;只要;除非;只要…就。例如:Only if it belongs to the insurance obligation field, the company should beresponsible for the compensation.只要是在保险责任范围内,保险公司就应负责赔偿。
2023-07-08 13:53:262

if only和only if区别是什么?

only if:只有、除非,意思相当于unless,但用于肯定句,引导条件状语从句:I will go only if you go with me.除非你跟我一起走,否则我就不走(只有你跟我一起走我才走).比较:unless,用于否定句:I won"t go unless you go with me.If only:只要,引导条件状语从句:If only it clears up,we"ll go.只要天一放晴,我们就走.要是……就好了,引导独立句:If only you had won the game!你要是赢了该多好啊.Only if 用于句首,用倒装语序,Only if a teacher has given permission is a student allowed to enter this room. 只有得到老师的允许,学生才能进入这间教室。if only: 但愿 表示对现在和将来的愿望,或与过去事实相反的愿望。 If only it would stop raining 真希望雨能停。一、if only的用法。if only后面跟的是虚拟语气的句子,表示与事实相反的假设。If only I had more money, I could buy some new clothes. 要是我有更多的钱,我可以买些新衣服。If only he had arrived in time. 要是他能及时赶到就好了。If only I had known it, I wouldn"t have troubled him. 要是我知道,我就不会麻烦他了。If only that photograph weren"t missing. 要是那张照片没丢失该多好。二、only if的用法。only if后面跟条件状语从句,用陈述语气,后面用部分倒装句,be动词、助动词和情态动词放在主语之前,表示一种充分非必要条件,意思是只要。Only if you passed the entrance exam and became a college student, will I accept you as a friend.只要你通过高考,成为大学生,我就会认你为朋友。Only if we persist in carrying out the open door policy, will we achieve greater success in every field.只要我们坚持改革开放,我们就能在各个方面取得更大的成就。
2023-07-08 13:53:541

only if引导什么从句

only if引导条件状语从句。 only:adv. 只有; 只; 仅; 仅在…情况下(或地点等); 只不过; 仅…而已。 if:conj. 如果; 假若; 倘若; 当; 无论何时; 每次; 与will或would连用,表示客气地请求。 扩展资料   Only if the red light comes on is there any danger to employees.   只有红灯闪亮时才有危及职工的险情。   Children are admitted only if accompanied by an adult.   儿童必须有成年人陪同方可入场。   I"ll do that, but only if we set a few rules.   我可以干,但我们得定几条规矩。   You can make progress only if you are modest.   惟虚心乃能进步。   The medicine works only if taken for a long time.   此药久服方见功。   I"ll go only if you go with me.   除非你跟我去,我才去。   One can grasp a foreign language only if he studies hard.   唯有努力学习,才能掌握外语。
2023-07-08 13:54:281

if only 和only if 在用法上的区别

同楼上
2023-07-08 13:54:372

高考英语语法: as long as与only if

高考英语语法:as long as与only if   一、基本用法的差别   1. as long as 有两个意思,一是用于本义,意为“与……一样长(久)”,在否定句中,也可说成 (not) so long as;二是用于引申义,表示“只要”,用于此义时也可说成 so long as(不管是肯定句、否定句还是疑问句)。如:   This river is as long as that one. 这条河与那条河一条长。   He lived abroad as long as five years. 他住在国外长达五年之久。   As [So] long as you need me, I"ll stay. 只要你需要我,我就留下。   As long as it doesn"t rain we can go. 只要不下雨,我们就可以去。   2. only if 可视为 if 的加强说法,即其中的 only 是修饰 if 从句的,其意为“只有在……条件下”。如:   I"ll tell you, but only if you don"t tell anyone else. 我可以告诉你,但条件是你不能告诉其他任何人。   I"ll accept the bill only if you send it to my home address. 你必须把账单送到我住的地方,我才愿意偿付。   二、语气上的差别   从语气上看,only if 的语气要比as long as 强,as long as 通常只是用于提出一个条件,与if 的意思比较接近;而only if 引出的从句内容则通常暗示它是主句内容的条件,含有“只有……才……”“只有在……的时候”“……的条件是……”之意。比较:   As long as you do your best, we"ll be happy. 只要你尽力,我们就满意了。   You can borrow the book as long as you keep it clean. 只要你不把书弄脏,这书你可以借。   We can succeed only if everyone in the team pulls his weight. 我们全队只有人人各尽所能才能取得成功。   The coach stops at the principal hotels to pick up tourists, but only if they arrange this in advance. 大客车到各主要的旅馆来接观光者,但条件是必须事先安排好。   三、动词搭配上的差别   在许多情况下,as long as 与 only if 均可用,只是语气有强弱之分。但是,当主句和从句的谓语动词均为短暂性动词时,通常只用 only if,而不用 as long as。如:   你只有请他,他才会来。   误:He will come as long as you ask him.   正:He will come only if you ask him.   析:此句中的 only if 不能用 as long as 代替,因为动词 ask 与 come 均短暂性动词。   四、两者在词序上的差别   两者均可引导从句置于主句之后,也可置于主句之前。但是,当only if 引导的状语从句置于主句之前时,其后的主句要用倒装语序,而且 as long as 引导的从句置于主句之前不用倒装。如:   As long as it doesn"t rain we can play. 只要不下雨,我们就能玩。   As long as you"re happy, it doesn"t matter what you do. 只要你高兴,你做什么都没关系。   Only if the red light comes on is there any danger to employees. 只要红灯一亮,就表示有危及职工的险情。   五、注意 only if 与 if only 的差别   only if 意为“只要”,可视为 if 的加强说法。而 if only 有两个意思,一是表示“只要”,此时通常与陈述语气连用,与 only if 用法相似;二是表示“但愿”“要是……就好了”,此时多与虚拟语气连用。如:   If only it clears up, we"ll go. 只要天晴,我们就去。   If only I hadn"t told him about it. 要是我没有告诉他这事就好了。   It"s a good plan, if only we could carry it out. 那是个不错的计划,但愿我们能实现它。   I will come only if you promise not to invite Mary. 只要你答应不请玛丽,我就来
2023-07-08 13:55:261

only if和unless的区别

onlyif用于肯定句,引导条件状语从句,而unless用于否定句。onlyif的意思是:只有,除非。相当于unless。分别用onlyif和unless举个例子吧:Iwillgoonlyifyougowithme.除非你跟我一起走,否则我就不走。这个句子如果用unless来翻译的话,就是:Iwon"tgounlessyougowithme.(否定句)
2023-07-08 13:55:351

onlyif位于句首,主句需要倒装吗

介词、否定词、介词短语位于句首,需要倒装。从句倒装,主句不倒装
2023-07-08 13:55:422

if only和only if它们分别的用法和意思

if only: 要是...多好Examples:1. If only he had been here. 要是他当时在这儿就好了。2. I dread the coming exams. If only I could have time to review my lessons. 我对即将到来的考试非常担心。如果我有时间复习该有多好啊。3. If only I had another chance. 要是我再有一次机会就好了。4. I am so tired. If only I can take the day off tomorrow. 太疲倦了。如果明天能不上班多好。5. If only problems would come one at a time! 要是问题一次只发生一个该多好!6. If only it clears up, we"ll go. 只要天一放晴,我们就去。7. If only one had an unlimited supply of money! 要是财源不断就好了!8. She would be a very good player if only she could get it together. 她若能控制得当就能成为很好的选手.only if: conj. 只有当(只是在...的时候)Examples:1. The company will succeed only if it have sufficient backing. 只有当该公司获得足够的资助,它才会成功。2. A compound proposition that has components joined by the word and or its symbol and is true only if both or all the components are true. 综合命题由和或其符号所连接的子句组成的复合命题,只有当所有子句为真时,该句才为真3. I can buy the house only if a mortgage for 2000 dollars is available. 只有拿到两千美元的抵押贷款,我才买得起那栋房子。4. Only if I get a job will I have enough money to go to school. 我只有找到了工作才有足够的钱上学。
2023-07-08 13:55:491

only if的用法与unless的用法有什么区别?

only if (用于句首,后接从句主谓倒装)只要;只有conj.只有当(只是在 ...的时候)例句:Only if I get a job will I have enough money to go to school这两个完全不同,那需要区别?unless===if notONLY if===only whenOnly if意为只有当 ......例:Only if you study hard can you get good grades.一般后面的主句用倒装,中间不隔开。unless是除非的意思例:I won"t go to the party unless invited..我只有找到了工作才有足够的钱上学.I can buy the house only if ...
2023-07-08 13:56:181

only if和unless的区别拜托各位了 3Q

only if用于肯定句,引导条件状语从句,而unless用于否定句。only if的意思是:只有,除非。相当于unless。分别用only if和unless举个例子吧:I will go only if you go with me.除非你跟我一起走,否则我就不走。这个句子如果用unless来翻译的话,就是:I won"t go unless you go with me.(否定句)
2023-07-08 13:56:271

as long as 与only if 的用法区别

as long as 与only if的用法区别 一、基本用法的差别1. as long as 有两个意思,一是用于本义,意为“与……一样长(久)”,在否定句中,也可说成 (not) so long as;二是用于引申义,表示“只要”,用于此义时也可说成 so long as(不管是肯定句、否定句还是疑问句)。如:This river is as long as that one. 这条河与那条河一条长。He lived abroad as long as five years. 他住在国外长达五年之久。He didn"t stay there as [so] long as she. 他在那儿住得不如她久。As long as it doesn"t rain we can go. 只要不下雨,我们就可以去。只要不下雨,我们就可以去。As [So] long as you need me, I"ll stay. 只要你需要我,我就留下。2. only if 可视为 if 的加强说法,即其中的 only 是修饰 if 从句的,其意为“只有在……条件下”。如:I"ll tell you, but only if you don"t tell anyone else. 我可以告诉你,但条件是你不能告诉其他任何人。I"ll accept the bill only if you send it to my home address. 你必须把账单送到我住的地方,我才愿意偿付。。 二、语气上的差别从语气上看,only if 的语气要比as long as 强,as long as 通常只是用于提出一个条件,与if 的意思比较接近;而only if 引出的从句内容则通常暗示它是主句内容的唯一条件,含有“只有……才……”“只有在……的时候”“……唯一的条件是……”之意。比较:As long as you do your best, we"ll be happy. 只要你尽力,我们就满意了。You can borrow the book as long as you keep it clean. 只要你不把书弄脏,这书你就可以借。We can succeed only if everyone in the team pulls his weight. 我们全队只有人人各尽所能才能取得成功。The coach stops at the principal hotels to pick up tourists, but only if they arrange this in advance. 大客车到各主要的旅馆来接观光者,但条件是必须事先安排好。 三、动词搭配上的差别在许多情况下,as long as 与 only if 均可用,只是语气有强弱之分。但是,当主句和从句的谓语动词均为短暂性动词时,通常只用 only if,而不用 as long as。如:。如:你只有请他,他才会来。误:He will come as long as you ask him.正:He will come only if you ask him.析:此句中的 only if 不能用 as long as 代替,因为动词 ask 与 come 均短暂性动词。 四、词序上的差别两者均可引导从句置于主句之后,也可置于主句之前。但是,当only if 引导的状语从句置于主句之前时,其后的主句要用倒装语序,而且 as long as 引导的从句置于主句之前不用倒装。如:As long as it doesn"t rain we can play. 只要不下雨,我们就能玩。As long as you"re happy, it doesn"t matter what you do. 只要你高兴,你做什么都没关系。Only if a teacher has given permission is a student allowed to enter this room. 只有得到教师的允许,学生才可以进这间屋。Only if the red light comes on is there any danger to employees. 只要红灯一亮,就表示有危及职工的险情。 五、注意 only if 与 if only 的差别only if 意为“只要”,可视为 if 的加强说法。而 if only 有两个意思,一是表示“只要”,此时通常与陈述语气连用,与 only if 用法相似;二是表示“但愿”“要是……就好了”,此时多与虚拟语气连用。如:I will come only if you promise not to invite Mary. 只要你答应不请玛丽,我就来。If only it clears up, we"ll go. 只要天晴,我们就去。If only I was rich. 要是我很有钱就好了。If only I hadn"t told him about it. 要是我没有告诉他这事就好了。It"s a good plan, if only we could carry it out. 那是个不错的计划,但愿我们能实现它。
2023-07-08 13:56:362

if only 和only if的区别和用法

1.only if 意思“仅仅如果”,用于引导条件状语从句,比if所表达的语气更强烈。置句首可引起倒装。例:Only if a teacher has given permission is a student allowed to leave the room. Children may enter the club only if they are accompanied by adults. 2.if only 用于虚拟语气,表示“要是...就好了“。它用来表达一个不可能实现的愿望或假设。与过去事实相反,后面跟过去完成时, had+过去分词与现在事实相反,后面跟一般过去时.与将来事实相反,后面跟一般过去时或should + 动词原形例:If only she would come!If only you had told me you had a spare ticket for the show. 如果你告诉我,你多了一张演出票就好了。If only one had an unlimited supply of money!
2023-07-08 13:56:553

only if造句

only if造句:I told him he would succeed only if he tried hard. 我告诉他,只有努力才能成功。
2023-07-08 13:57:101