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but为连词的按常见搭配与用法 1.but可用来连接表示对比的形容词或副词 2.but与although、though为什么不可搭配使用 3.but与however的差异 4.not...but… 5.not only…but (also)… ——本条目列为专题输出。 6.but then = then again = but then again 7.but后接动词不定式，什么情况需要使用to，什么时候可以省略？ ——本条目列为专题输出。 8.cannot but do cannot help but do cannot choose but do cannot help doing cannot help oneself from doing ——本条目已输出 9.have no (other) alternative/ choice/ option but to do have little choice but to do 10.but yet 11.may/might…but… 12.but that后的5种情况： 1） but that相当于except that，后接真实从句，而主句为虚拟语气的情形，如： 2） but that中的but是连词，其中的that可以省略，其后可以引导有结果含义的结果状语从句，如： 3） but that用于特殊疑问词who, what, when等引导的从句，如： 4） but that可用于believe, be sure, imagine, know, say, think等否定句或特殊疑问句之后（用于引导宾语从句），语义上相当于that…not。 5） 用于doubt, deny, question （用于否定或疑问形式） but that毫无疑问，一定…或it was impossible but (that)…结构中，肯定…，如： 13.I’m sorry/Excuse me/Forgive me, but… 14.not that…but that 15.not but that 16.never…but 17.I don’t know about you, but I have no idea but (that) it’s…, Jim, but not as we know it but为连词的按常见搭配与用法 1.but可用来连接表示对比的形容词或副词 《英语词汇用法辨析手册》（英马丁 曼瑟主编）第37页but词条 作为连词，but用于连接两个相反的概念： He lives in Surrey but works in London. 他住在萨里，但在伦敦上班。 不能用它连接两个一致的概念： She is not British-born, but originates from Kenya. 《朗文A-Z英语语法大全》第83页but词条 but有时用来连接位于名词前意思相对的形容词。例如： He gave away all his money. It was a generous but foolish thing to do. 他捐赠了所有的钱。这是一种虽然慷慨但却愚蠢的举动。 《文馨当代英汉词典》第259页but词条 but conj.（对等连接词）但是；然而 He’s an old but healthy man. 他虽然年老但却健康。 They are poor but happy. 他们贫穷但却快乐。 She doesn’t like classical music, but her husband does. 她不喜欢古典音乐，但她的丈夫喜欢。 《柯林斯高级英语用法词典》第145页but词条 可以用but来连接表示对比的形容词或副词。 …a small but comfortable hotel. ……一家规模不大但是舒适的旅馆。 We are poor but happy. 我们贫穷但是幸福。 Quickly but silently she darted out of the cell. 她迅速而又一声不响地飞跑出了牢房。 2.but与although、though为什么不可搭配使用 《英语常用词疑难用法手册》（陈用仪编著）第039页although词条 中国人往往把“虽然…但是…”照搬到英文，成为although/though…but…但这是错误的。用了although/though就不能再用but，用了but就不能再用although/though，两者是“势不两立”的。这一点许多人也懂得。 但是原因何在呢？原因就是：but不是副词，而是并列连词。 副词和连词的区别就是： 副词不是句子的根本成分，它只是“锦上添花”，加进了句子里并不改变句子的性质。 连词却不加进句子则已，一加进去就成了句子结构不可分割的一部分，而且句子因为加进了but这个并列连词就从独立句变成为并列句的第二分句。 连词but的特点，可以从一个现象看出来：but后面不能有停顿，在书面上表现为不能加逗号。以but开始的句子，不可能是独立的主句，只能两个并列句当中的第二分句（有时有些句子以but开始，其实也是并列分句省略了前一分句）。另一方面，以主从连词although/though开始的句子，既不可能是独立句，也不可能是并列句中的第一句，而只能是一个让步从句。 这一来，在although/though…but…的结构中，是一个让步从句（用主从连词引入）搭配一个并列句第二分句（用并列连词引入），没有主句，因而根本不成句子。 如果去掉although/though而保持but，则整个句子除了由两个并列分句组成的并列句，也可以成立。 3.but与however的差异 《英语常用词疑难用法手册》（陈用仪编著）第039页although词条 应该指出，语义上同but差不多的however或nevertheless等却不是连词而是副词，因此，它可以放在句首或句中，后面可以有停顿，书面上可以前后加逗号，而且可以与although/though相对连用。 《英语常用词疑难用法手册》（陈用仪编著）第378页however词条 用了although/though就不能用连词but，但是可以用副词however。由于however是副词，这就决定了使用时的一些规则： （1）如果前面用了although/though从句，主从句之间用逗号分开，however可以就在逗号后面，再加逗号，然后是主句；或者however可以插在主句当中，前后逗号。【例如】 Although this month seemed to be a very quiet month, however, there were a number of activities that had far reaching consequences. 或 Although this month seemed to be a very quiet month, there were, however,a number of activities that had far reaching consequences. （2）如果前面不用although/though，原来的原因从句就变成了独立句，此时它同后一句之间要用分号（；）隔开。后一句的however，也是既可以放在句首，后加逗号，也可以插在句中，前后逗号。【例如】 This month seemed to be a very quiet month; however, there were a number of activities that far reaching consequences. 或 This month seemed to be a very quiet month; there were, however,a number of activities that far reaching consequences. （3）如果干脆不用however而用but，则两个句子成了一个并列句的两个分句，彼此之间不用分号隔开，而用逗号（但是用分号也可以）： This month seemed to be a very quiet month, but there werea number of activities that had far reaching consequences. 4.not...but…不是…而是…；不在于…而在于…（否定前者，肯定后者） 本条目高考使用较多，属于短语句型中的大结构。 《剑桥高阶英汉双解词典》第284页but词条 She’s not a painter but a writer (= She is a writer, not a painter). 她不是画家而是作家。 《剑桥高阶英汉双解词典》第284页but词条 We must not complain about the problem, but (instead we must) help to put it right. 我们不应该抱怨问题，而是应该帮助解决问题。 《文馨当代英汉词典》第259页but词条 but（对等连接词）（与前面的否定词连用）不…而… It is not a sentence, but a clause. 那不是一个句子，而是个从句。 He didn’t go out but stayed at home. 他没有出去而留在家里。 5.not only…but (also)… 《牛津高阶英汉双解词典》第八版第1436页only词条 not only…but (also)…: both…and…不但…而且… He not only read the book, but also remembered what he had read. 他不但读了这本书，而且还记得所读的内容。 《朗文当代高级英语辞典》第1714页not词条4： not only…(but) also…不但/不仅 Shakespeare was not only a writer but also an actor. 莎士比亚不仅是个作家，而且还是位演员。 Not only do the nurses want a pay increase, they want reduced hours as well. 护士们不仅要求提高工资，还要求缩短工作时间。 《韦氏高阶英语词典》第1130页only词条 not only—used to say that both of two related statements are true Not only did they win, they won by a landslide. The killing of these animals is not only illegal, it’s also immoral. The game is not only lots of fun, it’s educational too! Photographs are not only permitted, they are encouraged. I’m concerned not only for myself, but for my children (as well). She had the nerve to accuse me of lying. And not only that, but she refused to apologize! The festivals take place not only in the city but also in the surrounding rural areas. 这里仅列举几个例子——not only…but (also)…也是个大话题，若展开讲解，就牵涉到至少三个方面的内容： 第1）：not only…but also…有多少同义的变形，如not merely/simply/just…but (also)等； 第2）：not only…but also…其中not only位于句首，究竟倒装与否？ 第3）：not only…but also…必须是连接同等平行的结构吗？ ——展开约有五六千字的内容，待日后输出。 6.but then = then again = but then again 对应的语义是：但是，不过话又说回来了，不过另一方面，但另一方面 另外的对等表现形式有，then again或but then again，相当于but on the other hand。 《英语语法大全》（上，张道真编著）第697页 He is a millionaire, but then (or but on the other hand) a drunkard. 《牛津高阶英汉双解词典》第八版第2164页then词条 but then, then again, but then again (informal):used to introduce additional information or information that contrasts with sth that has just been said（引出另外情况或相对照的情况）不过，可是话又说回来了 She was early, but then again, she always is. 她到得早，不过话又说回来了，她总是早到。 ‘So you might accept their offer?’ ‘Yes, then again I might not.’ “这么说你也许会接受他们的提议了？” “是的， 不过也可能不接受。” 《朗文当代高级英语辞典》第五版第316页词条6 but then (again)(spoken)（口）a) when you are adding a statement that stays almost the opposite of what you have just said不过，但另一方面 John might be ready to help us, but then again, he might not. 约翰可能愿意帮我们，但也可能不愿意。 You feel really sorry for him. But then again, it’s hard to like him. 你很同情他，可是很难喜欢他。 but then (again) (spoken)（口）b) used when you are adding a statement that makes what you have just said seem less surprising 不过（用于补充，使之前的话不那么令人震惊） Dinah missed the last rehearsal, but then she always was unreliable, wasn’t she? 戴娜上次排练没来，不过，她这人一向靠不住，对吗？ 《柯林斯高阶英汉双解学习词典》第346页词条10与词条11 You usebut then or but then again before a remark which slightly contradicts what you have just said.（表示与前面说过的话略有矛盾）不过，然而 My husband spends hours in the bathroom, but then again so do I. 我丈夫常占用浴室好几个小时，不过我也是这样。 You use but then before a remark which suggests that what you have just said should not be regarded as surprising. （表示前述事情并不奇怪）不过，但是 He was a fine young man, but then so had his father been. 他年轻有为，不过他父亲也曾是。 Sonia might not speak the English language well, but then who did? 索尼娅的英语也许说得不好，但谁又说得好呢？ 7.but后接动词不定式，什么情况需要使用to，什么时候可以省略？ ——本条目列为专题输出。 8.cannot but do cannot help but do cannot choose but do cannot help doing cannot help oneself from doing 【头条已发，见题目——“不得不；必然；不禁”的6种英语表达方式】 9.have no (other) alternative/ choice/ option but to do have little choice but to do 《牛津英语用法指南》（第三版）第149页3 but后面的动词 带to的动词不定式用作no alternative/choice/option but的后面 The train was cancelled, so I had no alternative but to take a taxi. 这趟火车取消了，我没有别的选择，只有乘出租车了。 《剑桥高阶英汉双解词典》第1532页option词条 have no option (but to do something):别无选择（只能做…） After her appalling behaviour, we had no option but to dismiss her. 鉴于她的恶劣行为，我们别无选择，只能解雇她。 《麦克米伦高阶英汉双解词典》第348页choice词条1a have no choice/ have little choice:别无选择；只好 I had no choice other than to accept what he said. 我除了接受他所说的之外别无选择。 Many mothers have little choice but to work. 许多母亲别无选择只好去工作。 《柯林斯高阶英汉双解学习词典》第432页choice词条4 If you have no choice but to dosomething or have little choice but to do it, you cannot avoid doing it. 不得不；只好 They had little choice but to agree to what he suggested. 他们别无选择，只好接受他的提议。 《朗文当代高级英语辞典》第五版第405页choice词条 have no choice (but to do sth)没有选择（而只能做某事） The men had no choice but to obey. 那些人别无选择，只能服从。 《朗文当代高级英语辞典》第五版第1773页option词条 Teenager mothers often have no option but to (= have no other choice except to) live with their parents. 少女妈妈往往别无选择，只能与父母同住。 10.but yet：但是 《文馨当代英汉词典》第2087页yet词条【用法】（4） conj.用法之yet略与nevertheless同义，语气比but强而比still弱，有文言意味而语气强，常作and yet，but yet等；（文）则常与although, though配合使用： Although I have known her only three years, yet she is my best friend. 虽然我只认识她三年，但她是我最好的朋友。 《现代英语用法词典》（修订版 张道真主编）第1872页 and (but) yet但是 I offered him still more, and yet he wasn’t satisfied. She’s vain and foolish, and yet people like her. He’s pleasant enough, and yet I don’t like him. She’s a funny girl, but yet you can’t help liking her. 《当代高级英语语法》（徐广联主编 精装版）第844页J but和yet尽管都可译为“但是”，区别还是有的，主要由如下几点： but是并列连词，而yet可作并列连词或副词，不可数and but，但可说and yet, but yet。 but不可放在句尾，而yet则可放在句尾。 but对于对照或对立时，一般都比较轻松自然，而yet表示对照或对立时，则往往比较强烈，时常出人意料。 but在某些习惯说法中不可用yet替代。 11.may/might…but… 《韦氏高阶英语词典》第1009页may词条2 may—used to say that one thing is true but something else is also true He may (= might)be slow, but he does very good work. = Slow though he may be, he (still) does very good work. = (= although he’s slow, he does very good work) It may (= might) be cold outside, but it’s still a beautiful day. (= although it’s cold outside, it’s still a beautiful city) She may (= might)have been a great actress, but she was a terrible parent. 《牛津高阶英汉双解词典》第八版第1285页may词条2 may: used when admitting that sth is true before introducing another point, argument, etc. （转折前所述情况属实）也许，可能 He may be a good father but he’s a terrible husband. 他或许是一位好父亲，但却是个很糟糕的丈夫。 《柯林斯高阶英汉双解学习词典》第1624页may词条5 You use may in statements where you are accepting the truth of a situation, but contrasting it with something that is more important. 尽管，或许（用于承认情况属实，但同时与更重要的事情作比较） I may be almost 50, but there’s not a lot of things I’ve forgotten. 尽管我已经快到了知天命的岁数，但记忆却不那么糟糕。 The elderly man may not be typical, but he speaks for a significant body of opinion. 这位老人也许并没有代表性，但他所说的话却代表者相当一部分人的观点。 Walking exercise may be boring at times but early on a clear sunny morning there can be nothing finer. 有时候散步这种锻炼方法也许会比较枯燥，但若是在一个阳光明媚的清晨，还有什么比这更惬意的呢？ 《牛津英语用法指南》（第三版）第505页342页 may和might（5）：may/might…but may（有时用might）用在讨论中，很像although或even if：可以表示某事是真实的，但这并不影响主要论点。后面常跟but。 He may be clever, but he hasn’t got much common sense. (= Even if he’s clever, he…或Although he’s clever, he…) 他也许聪明，但不太通情达理。 It may be a comfortable car, but it uses a lot of petrol. 这辆汽车可能很舒适，但耗油太多。 She might have had a lovely voice when she was younger, but… 她年轻时也许嗓音挺动人，但是…… 请注意：在这个结构中，may和might可以用来谈论肯定是真实的事，而不只是可能的事。 You may be my boss, but that doesn’t mean you’re better than me. 你可以做我的老板，但这并不等于你就比我好。 《文馨当代英汉词典》第259页but词条 but（对等连接词）（用在含有(it is) true, of course, indeed, may等的从句之后，以表示让步）可是： Indeed he is young, but he is very brave. 他的确年轻，可是他很勇敢。 You may not believe it, but it’s true. 你可能不相信，可是那是真的。 12.but that后的5种情况： 1） but that相当于except that，后接真实从句，而主句为虚拟语气的情形，如： 2） but that中的but是连词，其中的that可以省略，其后可以引导有结果含义的结果状语从句，如： 3） but that用于特殊疑问词who, what, when等引导的从句，如： 4） but that可用于believe, be sure, imagine, know, say, think等否定句或特殊疑问句之后（用于引导宾语从句），语义上相当于that…not。 5） 用于doubt, deny, question （用于否定或疑问形式） but that毫无疑问，一定…或it was impossible but (that)…结构中，肯定…，如： 具体阐释如下： 1）but that相当于except that，后接真实从句，而主句为虚拟语气 but that，相当于except that，相当于but/except for the fact that，后面所引导的是真实的情形，而对应的主句往往是虚拟语气。 《英汉多功能词典》外文社第2版第132页but词条 but that还常引出否定意义的非真实条件从句，这里but that相当于but for the fact，译作“假如没有…”或“要不是”。 《英语语法大全》（夸克等著）第1377页 [f] but that作 “except (that)”解时为从属连词： She would have ignored Edward but that she knew he would have complained to her sister. 《文馨当代英汉词典》第259页but词条 but: prep. but that：要不是，若非 They would have succeeded in reaching the summit but that rain came on. 要不是下雨，他们就可抵达山顶了。 《现代英语用法词典》（修订版 张道真主编）第177页but词条 but that 若不是； He would have helped us but that he was short of money at the time. But that he was prevented, he would have accomplished his design. I’d have come with you but that I am so busy. He would have said no but that he was afraid. 2）but that中的but是连词，其中的that可以省略，其后可以引导有结果含义的结果状语从句，如： 《英汉多功能学习词典》第218页but词条 but （旧词）（正式）（在否定句或疑问句中引导表示所带来的必然结果，则带情况的副词从句，相当于(that…not)but与not so或not such相呼应）没有到…的地步（that…not）（常书面语） No one is so old but that he may learn. 没有人因为太老而不能学习（活到老，学到老）。 （通常说：No one is so old that he may not learn.） 《现代英语用法词典》（修订版 张道真主编）第177页but词条3 but（用在某些否定句后）起连接作用，没有特别意思（作用和that差不多） No task is so difficult but we can accomplish it. 3）but that用于特殊疑问词who, what, when等引导的从句，如： 《英语常用词疑难用法手册》陈用仪编著第154页but词条（10） but有一个特殊用法，是Who knows but (that)…?意思是“说不定”、“也许”，从句的内容肯定或否定共同语言形式一致。【例如】 Who knows but that he may go? 他说不定能去。 Who knows but that everything will come right? 事情会一帆风顺也说不定。 When I play with my cat, who knows but that she regards me more as a plaything than I do her? 当我同我的猫玩耍的时候，我把它当作玩物，当说不定它更加把我当作玩物呢？ 《现代英语用法词典》（修订版 张道真主编）第177页but词条 who (what) …but不是别人正是…（出乎意料地出现）（不是别的…原来是） Old cold, wretched night, when I was so tired I could hardly keep myself awake, who should come up for a half of Scotch but Lizzie. Who should come in but his first wife! And when I got off the boat whom should I see but Ruggles. What should I find but an enormous spider! 4）but that可用于believe, be sure, imagine, know, say, think等否定句或特殊疑问句之后（用于引导宾语从句），语义上相当于that…not。 I don’t know but that 《21世纪大英汉词典》（李华驹主编）第374页词条5 but（用于否定结构之后，表示否定意义，相当于(that…not）而不： I never think of snow but I think of my youth. 一想到下雪，我就会想起我的青年时代。 《21世纪大英汉词典》（李华驹主编）第374页词条6 but（用于think, say, conceive等动词的否定或疑问形式之后，相当于(that)…not） I can’t say but (that) he may be wrong. 我不能说他可能不错。 《文馨当代英汉词典》第259页but词条 but（从属连接词）（常作but that（口what）,用于say, know, believe, be sure等的否定句或特殊疑问句之后，以引接宾语从句）but that = that…not Who knows but that it may be true? 谁知道那也许是真的？（说不定那是真的） 《英汉多功能学习词典》第218页but词条 （用于expect, know, think, say, see, be sure等动词的否定或疑问形式后，相当于that…not）不是…，不会…(that从句，非正式what从句) I don’t know (am not sure) but it is all true. 这大概不全是真的吧。 5）用于doubt, deny, question（前有否定词，或疑问形式） but that毫无疑问，一定… 《英汉多功能词典》外文社第2版第132页but词条 否定词 doubt（或deny, question等） but that中的but that相当于that, but无否定意义，常可省略。 《英汉多功能学习词典》第218页but词条 （用于deny, doubt, question, wonder等动词的否定或疑问形式后，相当于that）…事 （that从句，非正式what从句） I don’t doubt but that he will do it. 我想他一定会做那事。 doubt, question等用作名词时用法相同： There is no doubt but (that) he won. 毫无疑问他会赢。 《21世纪大英汉词典》（李华驹主编）第374页词条4 but（有时作but that，用于doubt, deny, questions等动词的否定式或疑问形式之后，无实义，表示否定意义，相当于that） I don’t doubt that she will win the race. 我敢断定她会在赛跑中获胜。 《麦克米伦高阶英汉双解词典》第274页 no doubt/question but that【正式】毫无疑问 There was no doubt but that the poor girl had committed suicide. 毫无疑问那个可怜的女孩自杀了。 《现代英语用法词典》（修订版 张道真主编）第177页but词条3 but（用在某些否定句后）起连接作用，没有特别意思（作用和that差不多） There’s no doubt (no question) but he’s the guilty one. There is no doubt but he will recover. It is not impossible but such a day may come. （这样的日子不是不可能到来的） He didn’t doubt but that (= that) snow would shortly fall. Poor Jimmie never doubted but that his own shrill was shared by all the others. I don’t doubt but that you are surprised. 《英语常用词疑难用法手册》陈用仪编著第154页but词条（11） but另一个特殊用法，是It was impossible but (that)…以but来否定后面从句的内容，加上前面的impossible，形成“否定 否定= 强意肯定”，表示过去的“不可能不”，亦即“一定是”。【例如】 It was impossible but they must have observed it. 他们不可能没有观察到这一点。 It was impossible but that the vast mass of the icebergs must have been subjected to climate influences; ruptures must surely have taken place at some points. 冰山的巨大质块已经收到过气象变化的影响，某些地方肯定发生过断裂。 13.I’m sorry/Excuse me/Forgive me, but… 《柯林斯高阶英汉双解学习词典》第345页but词条3 You use but after you have made an excuse or apologized for what you are just about to say. （用于表示歉意）但是 Please excuse me, but there is something I must say. 不好意思，但有些话我必须说。 I’m sorry, but it’s nothing to do with you. 对不起，但是这跟你没关系。 Forgive me asking, but you’re not very happy, are you? 恕我冒昧，你不太高兴，是吗？ 《麦克米伦高阶英汉双解词典》第273页 词条3 but used in polite questions, requests, and statements（口）used after expressions such as ‘I’m sorry’ and ‘excuse me’ to introduce a polite question, request, or statement（用于I’m sorry, excuse me等表达法中来引导有礼貌的提问、请求或陈述） Excuse me, but is there a post office anywhere around here? 对不起，请问这附近有邮局吗？ I’m sorry, but all our operators are busy at the moment. 对不起，我们所有的接线员现在都很忙。 《英语常用词疑难用法手册》（陈用仪编著）第674页sorry词条 中文说了“对不起”或“很遗憾”之后，就可以马上说出使得对方不高兴的信息。但是英文说了“对不起”或“很遗憾”，往往再要加上一个but，再说出不愉快的话语。【例如】 I’m sorry, but I can’t go. 对不起，我不能去。 意义类似于sorry的其他例句，也有类似的情况。【例如】 Excuse me, but you’re wrong. 对不起，你错了。 Excuse me, but could you tell me the way to the YMCA? 对不起，您能告诉我去基督教青年会的路怎么走吗？ I apologize for this intrusion, but you have a visitor. He insists it is urgent. 对不起，打扰了，有客人找您。他坚持说事情很紧急。 Jim sends his apologies, but he cannot come. 吉姆表示歉意，他不能来（不能译成：吉姆表示歉意，但是他不能来）。 这里面有一个语言心理问题。在英语（还有许多欧洲语言也如此），说“对不起”，“遗憾”，多少有点表示自己满足不了对方想得到满意信息（或至少不愿收到不愉快信息）的欲望，请对方谅解。说了这个意思之后，就需要转换口气，表示尽管如此，还是不得不说出令对方不愉快的信息，因此就往往需要加上一个but。 而在中文，“对不起”本身就有令对方不快的口气，没有多少请求谅解的谦恭含义，因而后面可以直接接上令对方不愉快的内容。 所以，中文如果说“对不起，但是我不能去”，听起来语气就不够通顺。 这个but有时候甚至于相当于中文的“因为”，用来表示自己未能满足对方愿望的理由。【例如】 I am sorry I haven’t written before but I’ve been very busy lately as Tom has been away. 因汤姆在外，贱务很忙，未能及早奉复为歉。 14.not that…but that，不是…而是… 《英汉多功能词典》外文社第2版第132页but词条 相当于not because…but because…，作“不是…而是…” 《英语语法大全》（上，张道真编著）第698页 Not that he is lazy, but that he can’t find a job. 《文馨当代英汉词典》第260页but词条 not but…but that…不是…而是… Not that I dislike golf, but that I have no time. 不是我不喜欢高尔夫球，而是我没有时间（that有because的意味）。 15.not but that 《文馨当代英汉词典》第260页but词条 not but that (what)…= （古）not but…并非不；虽然： I can’t go, not but that I’d like to. 我是不能去，并非不肯去。 （现在通常说成I can’t go, not that I wouldn’t like to.） 《21世纪大英汉词典》（李华驹主编）第374页 not but that（或what） 1.尽管，虽然，然而还是 2.（常与such连用）不是…而不会不 《英汉多功能词典》外文社第2版第132页but词条 not but that…是it is not but that的省略法，but无否定意义，作“虽然…可是…” 16.never…but 《英汉多功能词典》外文社第2版第132页but词条 never but…中，but引出的分句相当于without 动名词，作“不…则已，一…就…” 《文馨当代英汉词典》第259页but词条 never…but..每逢…必定；每当…总会 but（在否定结构后）无…（that…not），…而不（= if …not） It never rains but it pours. （谚）不下则雨已，以下就是倾盆大雨（喻祸不单行）。 《21世纪大英汉词典》（李华驹主编）第374页but词条3 but（相当于if…not）若不，除非 It never rains but it pours. （谚语）不雨则已，一雨倾盆。（指事情不发生则已，一旦发生便接踵而来） 《麦克米伦高阶英汉双解词典》第273页 词条7 but【正式】used after negative statements for saying that something does not happen without something else happening or being true（用于否定句后表示如果另一件事不发生某事就不会发生） I never take a bath but the phone rings or someone knocks at the door. 我每次洗澡时总会有电话或有人敲门。 《英汉多功能学习词典》第218页but词条 but （旧词）（正式）（在否定句或疑问句中引导表示所带来的必然结果，则带情况的副词从句，相当于(that…not) 而不… It never rains but it pours. （谚语）不下则已，一下倾盆（不来则已，来则不止）。（尤指坏事接二连三地发生） You cannot read that book but you will change your thinking. 你读了那本书，思想必然会发生变化。 （通常说：You cannot read that book without changing your thinking.） 17.I don’t know about you, but 《朗文当代高级英语辞典》第五版第1392页know词条23 I don’t know about you, but…我不知道你怎么想，但是…（用于对别人提出观点、决定或建议，但又不确定别人是否看法一致） I don’t know about you, but I’ll be glad when Christmas is over. 不知道你怎么想，我是希望圣诞节早点结束。 I have no idea but (that) 《英语常用词疑难用法手册》陈用仪编著第154页but词条（9） but另一个特殊用法，是I have no idea but [that]…，表示…“说不定”、“也许”。【例如】 I have no idea but they will insist upon the whole amount being paid. 说不定他们会坚持要求全额支付。 I have no idea but it seemed like the right thing to do at the time. 当时那样做，看起来也许是做得对的。 it’s…, Jim, but not as we know it 《朗文当代高级英语辞典》第五版第1393页know词条52 it’s …, Jim, but not as we know it【非正式，幽默】那算是…，但不是我们所熟悉的那种 It’s the blues, Jim, but not as we know it. 那算是布鲁斯音乐吧，但不是我们所熟悉的那种。 【因本文内容逻辑性很强，本人该方面一向不好，行文中若有差错，望指正。】
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