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英语转折连词问题 but however while yet 四个词的用法区别是什么
but是连词,表示（较强的）转折,连接两个句子时只用加逗号.例如：I love her,but she doesn't love me.
however是副词,也表示（较强的)转折,但连接两个句子时要用分号,而且在这个词后还要加逗号.例如：I love her; however,she doesn't love me.或者将两句子分开写.例如：I love her.However,she doesn't love me.
while作连词使用时,表示（较弱的）转折,连接两个句子时用逗号,但两个句子的主语不一样.例如:I like singing,while my sister likes dancing.
yet作连词使用时,也表示（较弱的）转折,连接两个句子时也用逗号,但两个句子的主语是一样的.例如：He has a good job,yet he never seems o have any money.
yet作为连词表转折时和but有什么区别并且请给出相应的例句.
yet一般是用在完成时的
but则没有The teacher speak quickly but very clearly.
but不会放在句末,语气较强,与前面说的情况相反.
yet一般放在句末,用于否定句.指不管作出多大努力,仍达不到预期的结果.
I tried hard to work out the problem,yet I failed.
英语中but和however区别
but conj.1. 但是, 然而2. 而是3. 除了, 除去4. 相当于that(用于否定结构后) prep.1. [常用于 nobody,no one,all, who 等词后面]除…以外,除…外,除了 adv.1. 只, 仅仅2. 不过，只不过3. 只是，刚才，方才4. 另一方面；还，尚] n. 1. 借口；推辞 2. 但是，反对，限制(用于表示反对，= buts) pron. 1. [关系代词,意义相当于 who…not; which…not] vt 1. 对…说“但是” yet adv. 1. 还, 尚, 仍然2. 已经3. 甚至, 更4. 现在；即刻； 1. but的用法。but主要用于表示转折，意为“但是”It was a sunny but not very warm day. 那一天天气晴朗，却不太暖和。He drives not carefully but slowly. 他开车不是很小心，而是开得很慢。【注】不要按汉语意思</A>将“虽然…但是…”直译为although…but…误：Though we are poor, but we are happy. (去掉though或but中任一个)2. yet的用法。与but一样，yet也主要用于转折，意为“但是”“而”I have failed, yet I shall try again. 我失败了，但我还要尝试。【注】有时可与并列连词</A>and或but连用，构成习语and yet和but yet，且两者大致同义(均相当于表转折的but)She drove very fast to the airport, but [yet, and yet, but yet] she missed the plane. 她开快车去机场，可还是误了飞机。 </B></A></B></B></B></B></B></B>
and yet和but yet的区别
but是并列连词，yet属于副词
but一般是在句子的开始部分，而yet是用于句尾的
but是用语肯定句中，yet用语否定句或疑问句中
一、副词 yet 作“还”，“仍然”讲
1. Much yet remains to be done. 尚有许多事情待做。
2. Yet molecules are always moving, some perhaps as fast as a mile per second.
分子仍然总在运动，其中有些分子的运动速度达每秒一英里。
3. The experiment is not yet over. 这项试验尚未结束。
4. No one has yet seen an electron. 还没人见过电子。
5. Man has not yet learned to store the sun's heat. 人类尚未学会贮藏太阳热。
二、副词 yet 和比较级连用，作“还要”，“更”讲，常可用 even 代替
1. This is a yet ( 或 even) more difficult task. 这是一项更为艰巨的任务。
2. We must study yet ( 或 even) harder. 我们必须更加努力学习。
三、副词 yet 用于现在完成时作“已经”讲，只用于否定句和疑问句中
1. Have you seen such a space shuttle yet? 你（已）见过这样的航天飞机吗？
2. Has the bell rung yet? 铃已打过了吗？
3. The bell has not been repaired yet. 铃尚未修好。
注：在肯定句中表示“已经”要用 already，不能用 yet。若在疑问句中用 already 代替 yet，则表示惊异的语气。
eg: Has the bell rung already? 铃真的打过了吗？
四、连词 yet 和 and yet, but yet 用法举例
1. It is very good, yet ( 或 but) it can be better. 这很好，但还能精益求精。
2. It is strange, and yet it is true. ( =It is strange yet ( 或 but) true.) 真奇怪，却是真的。
3. Air has weight, and yet it is very light. 空气有重量，虽然很轻。
4. Although this matter sounds strange, yet it is true. 此事听起来虽然奇怪，但却是事实。
5. The wheel is the simplest yet ( 或 but) perhaps the most remarkable of all inventions.
轮子是所有发明中最简单却也许是最非凡的一种。
6. Everyone thinks that this is a simple method, (but) yet he cannot believe it.
大家都认为只是个简单方法，但他不信。
五、词组 as yet （到目前为止）和 just yet （就在此刻）常用于否定句中
1. They have not made such an advanced computer as yet.
他们目前尚未制造出这样一种先进的计算机。
2. No one has as yet been able to produce the absolute zero of temperature.
还没有人能产生绝对零度。
3. It will not happen just yet. 此事一时尚不至于发生。
but
prep. 除...以外
conj. 而是, 但是
adv. 几乎, 仅仅
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