should与could的区别 英语中should和could的区别
should \u548ccould\u7684\u533a\u522b\u4e24\u8005\u90fd\u662f\u60c5\u6001\u52a8\u8bcd\uff0cshould \u6307\u5e94\u8be5\uff0ccould \u662f\u80fd\u591f
could\u662f\u201c\u53ef\u4ee5\u201d\u5728\u7ed9\u4eba\u5efa\u8bae\u65f6\uff0c\u662f\u4f9b\u4eba\u53c2\u8003\u7528\uff0c\uff08\u5bf9\u81ea\u5df1\u7684\u5efa\u8bae\u4e5f\u4e0d\u662f\u5f88\u6709\u4fe1\u5fc3\u662f\u4e00\u5b9a\u53ef\u4ee5\u65f6\u7528\uff09\u8bed\u6c14\u8f83\u4e3a\u6e29\u548c\u3002should\u662f\u201c\u5e94\u8be5\u201d\uff0c\u5e26\u6709\u547d\u4ee4\u7684\u611f\u89c9\u3002
1. can (could)
1\uff09\u8868\u793a\u80fd\u529b\uff0ccould\u4e3b\u8981\u6307\u8fc7\u53bb\u65f6\u95f4\u3002
Two eyes can see more than one. \u4e24\u53ea\u773c\u6bd4\u4e00\u53ea\u773c\u770b\u5f97\u6e05\u3002
Could the girl read before she went to school? \u8fd9\u5973\u5b69\u4e0a\u5b66\u524d\u80fd\u8bc6\u5b57\u5417\uff1f
2\uff09\u8868\u793a\u53ef\u80fd\uff08\u7406\u8bba\u4e0a\u6216\u662f\u903b\u8f91\u5224\u65ad\u4e0a\uff09\u3002
The temperature can fall to \u201360\u2103, that is 60\u2103 below freezing.
\u6c14\u6e29\u53ef\u964d\u81f3\u201460\u2103\uff0c\u4e5f\u5c31\u662f\u96f6\u4e0b60\u2103\u3002
He can´t (couldn´t) have enough money for a new car. \u4ed6\u4e0d\u53ef\u80fd\u6709\u8db3\u591f\u7684\u94b1\u4e70\u65b0\u8f66\u3002
You mustn´t smoke while you´re walking around in the wood. You could start a fire.
\u5728\u6797\u5b50\u91cc\u8d70\u65f6\u52ff\u5438\u70df\uff0c\u90a3\u6837\u53ef\u80fd\u4f1a\u5f15\u8d77\u706b\u707e\u3002
3\uff09\u8868\u793a\u5141\u8bb8\u3002
Can I have a look at your new pen? \u6211\u53ef\u4ee5\u770b\u4e00\u770b\u4f60\u7684\u65b0\u94a2\u7b14\u5417\uff1f
He asked whether he could take the book out of the reading\u2014room.
\u4ed6\u95ee\u4ed6\u53ef\u4e0d\u53ef\u4ee5\u628a\u4e66\u5e26\u51fa\u9605\u89c8\u5ba4\u3002
4\uff09\u8868\u60ca\u5f02\u3001\u6000\u7591\u3001\u4e0d\u76f8\u4fe1\u7b49\u6001\u5ea6\u3002\u4e3b\u8981\u7528\u4e8e\u5426\u5b9a\u53e5\u3001\u7591\u95ee\u53e5\u6216\u611f\u53f9\u53e5\u4e2d\u3002
Where can (could) they have gone to? \u4ed6\u4eec\u4f1a\u53bb\u54ea\u513f\u4e86\u5462\uff1f
He can´t (couldn´t) be over sixty. \u4ed6\u4e0d\u53ef\u80fd\u8d85\u8fc7\u516d\u5341\u5c81\u3002
How can you be so careless? \u4f60\u600e\u4e48\u8fd9\u4e48\u7c97\u5fc3\uff1f
5\uff09\u6bd4\u8f83\u59d4\u5a49\u5ba2\u6c14\u5730\u63d0\u51fa\u95ee\u9898\u6216\u9648\u8ff0\u770b\u6cd5\u3002
Can (Could) you lend me a hand? \u5e2e\u6211\u4e00\u628a\u597d\u5417\uff1f
I´m afraid we couldn´t give you an answer today. \u6050\u6015\u6211\u4eec\u4eca\u5929\u4e0d\u80fd\u7ed9\u4f60\u7b54\u590d\u3002
2. should
1\uff09\u8868\u4e49\u52a1\u3002\u610f\u4e3a\u201c\u5e94\u8be5\u201d\uff08\u67d0\u4ef6\u4e8b\u5b9c\u4e8e\u505a\uff09\uff0c\u7528\u4e8e\u5404\u79cd\u4eba\u79f0\u3002
You should be polite to your teachers. \u4f60\u5bf9\u8001\u5e08\u5e94\u8be5\u6709\u793c\u8c8c\u3002
You shouldn´t waste any time. \u4f60\u4e0d\u5e94\u8be5\u6d6a\u8d39\u65f6\u95f4\u3002
2\uff09\u8868\u63a8\u6d4b\uff0c\u610f\u4e3a\u201c\u60f3\u5fc5\u4e00\u5b9a\u3001\u7167\u8bf4\u5e94\u8be5\u3001\u4f30\u8ba1\u201d\u7b49\u3002
The film should be very good as it is starring first\u2014class actors.
\u8fd9\u90e8\u65b0\u7535\u5f71\u662f\u4e00\u6d41\u6f14\u5458\u4e3b\u6f14\u7684\uff0c\u4f30\u8ba1\u62cd\u5f97\u5f88\u597d\u3002
They should be home by now. \u7167\u8bf4\u4ed6\u4eec\u73b0\u5728\u5e94\u5f53\u5df2\u7ecf\u5230\u5bb6\u4e86\u3002
\u7ed3\u5408\u5bf9\u6bd4\uff1a
1.could\u548cshould\u505a\u731c\u6d4b\u8bed\u6c14\u7684\u65f6\u5019 could\u7684\u8bed\u6c14\u6bd4should\u66f4\u80af\u5b9a
eg\uff1a"The answer could be right.\u201c\u7684\u8bed\u6c14\u5c31\u6bd4"The answer should be right."\u80af\u5b9a
\u4f46\u662f \u5177\u4f53\u7684\u5e94\u7528\u5374\u8981\u770b\u8bed\u5883 \u8fd9\u5c31\u6bd4\u8f83\u96be\u5224\u65ad\u4e86
2.should\u60c5\u6001\u52a8\u8bcd\u4f5c\u4e3a\u63a8\u6d4b \u662f\u6309\u5e38\u7406\u63a8\u6d4b \u8fd1\u4e8e\u4e8b\u5b9e \u591a\u8868\u793a\u201c\u7406\u5e94\u201d\u505a\u4ec0\u4e48
\u4ee5\u53e5\u5b50\u4e3a\u4f8b There should (chould\u9519) be any difficulty about passing the road tese since you have practiced a lot in the driving school.\uff08\u540c\u5b66\uff0c\u987a\u4fbf\u63d0\u8bf7\u4e00\u4e0b.....any\u540e\u5e94\u8be5\u7528difficulties\uff09
\u5c31\u8868\u793a\u201c\u4f60\u7ec3\u4e60\u4e86\u90a3\u4e48\u591a\uff0c\u8def\u8003\u7406\u5e94\u6ca1\u6709\u4efb\u4f55\u56f0\u96be\u7684\u901a\u8fc7.\u201d
It's 7o'clock \uff0cjack should be here at any moment.
\u4e3a\u4ec0\u4e48\u4e0d\u7528could\uff1f\u660e\u663e\u7684 \u5df2\u7ecf\u4e03\u70b9\u4e86\uff0c\u6309\u8bed\u5883\uff0cjack\u968f\u65f6\u4f1a\u5230\u8fd9\uff0c\u6216\u8005\u8bf4\u201c\u7406\u5e94\u201d\u968f\u65f6\u5230\u8fd9\u65f6 should\u5c31\u6bd4could\u80af\u5b9a\u8bed\u6c14\u5f3a\u70c8\u3002
\u6240\u4ee5\u8fd9\u7c7b\u9898\u76ee\u7ed3\u5408\u8bed\u5883\u5f88\u91cd\u8981 \u82e5\u662f\u8868\u793a\u201c\u53ef\u80fd\u201d\u5c31\u7528could \u201d\u7406\u5e94\u201d\u5c31\u7528should
\u56de\u7b54\u8005\uff1ateacher068
can (could)
1\uff09\u8868\u793a\u80fd\u529b\uff0ccould\u4e3b\u8981\u6307\u8fc7\u53bb\u65f6\u95f4\u3002
Two eyes can see more than one. \u4e24\u53ea\u773c\u6bd4\u4e00\u53ea\u773c\u770b\u5f97\u6e05\u3002
Could the girl read before she went to school? \u8fd9\u5973\u5b69\u4e0a\u5b66\u524d\u80fd\u8bc6\u5b57\u5417\uff1f
2\uff09\u8868\u793a\u53ef\u80fd\uff08\u7406\u8bba\u4e0a\u6216\u662f\u903b\u8f91\u5224\u65ad\u4e0a\uff09\u3002
The temperature can fall to \u201360\u2103, that is 60\u2103 below freezing.
\u6c14\u6e29\u53ef\u964d\u81f3\u201460\u2103\uff0c\u4e5f\u5c31\u662f\u96f6\u4e0b60\u2103\u3002
He can´t (couldn´t) have enough money for a new car. \u4ed6\u4e0d\u53ef\u80fd\u6709\u8db3\u591f\u7684\u94b1\u4e70\u65b0\u8f66\u3002
You mustn´t smoke while you´re walking around in the wood. You could start a fire.
\u5728\u6797\u5b50\u91cc\u8d70\u65f6\u52ff\u5438\u70df\uff0c\u90a3\u6837\u53ef\u80fd\u4f1a\u5f15\u8d77\u706b\u707e\u3002
3\uff09\u8868\u793a\u5141\u8bb8\u3002
Can I have a look at your new pen? \u6211\u53ef\u4ee5\u770b\u4e00\u770b\u4f60\u7684\u65b0\u94a2\u7b14\u5417\uff1f
He asked whether he could take the book out of the reading\u2014room.
\u4ed6\u95ee\u4ed6\u53ef\u4e0d\u53ef\u4ee5\u628a\u4e66\u5e26\u51fa\u9605\u89c8\u5ba4\u3002
4\uff09\u8868\u60ca\u5f02\u3001\u6000\u7591\u3001\u4e0d\u76f8\u4fe1\u7b49\u6001\u5ea6\u3002\u4e3b\u8981\u7528\u4e8e\u5426\u5b9a\u53e5\u3001\u7591\u95ee\u53e5\u6216\u611f\u53f9\u53e5\u4e2d\u3002
Where can (could) they have gone to? \u4ed6\u4eec\u4f1a\u53bb\u54ea\u513f\u4e86\u5462\uff1f
He can´t (couldn´t) be over sixty. \u4ed6\u4e0d\u53ef\u80fd\u8d85\u8fc7\u516d\u5341\u5c81\u3002
How can you be so careless? \u4f60\u600e\u4e48\u8fd9\u4e48\u7c97\u5fc3\uff1f
5\uff09\u6bd4\u8f83\u59d4\u5a49\u5ba2\u6c14\u5730\u63d0\u51fa\u95ee\u9898\u6216\u9648\u8ff0\u770b\u6cd5\u3002
Can (Could) you lend me a hand? \u5e2e\u6211\u4e00\u628a\u597d\u5417\uff1f
I´m afraid we couldn´t give you an answer today. \u6050\u6015\u6211\u4eec\u4eca\u5929\u4e0d\u80fd\u7ed9\u4f60\u7b54\u590d\u3002
should
1\uff09\u8868\u4e49\u52a1\u3002\u610f\u4e3a\u201c\u5e94\u8be5\u201d\uff08\u67d0\u4ef6\u4e8b\u5b9c\u4e8e\u505a\uff09\uff0c\u7528\u4e8e\u5404\u79cd\u4eba\u79f0\u3002
You should be polite to your teachers. \u4f60\u5bf9\u8001\u5e08\u5e94\u8be5\u6709\u793c\u8c8c\u3002
You shouldn´t waste any time. \u4f60\u4e0d\u5e94\u8be5\u6d6a\u8d39\u65f6\u95f4\u3002
2\uff09\u8868\u63a8\u6d4b\uff0c\u610f\u4e3a\u201c\u60f3\u5fc5\u4e00\u5b9a\u3001\u7167\u8bf4\u5e94\u8be5\u3001\u4f30\u8ba1\u201d\u7b49\u3002
The film should be very good as it is starring first\u2014class actors.
\u8fd9\u90e8\u65b0\u7535\u5f71\u662f\u4e00\u6d41\u6f14\u5458\u4e3b\u6f14\u7684\uff0c\u4f30\u8ba1\u62cd\u5f97\u5f88\u597d\u3002
They should be home by now. \u7167\u8bf4\u4ed6\u4eec\u73b0\u5728\u5e94\u5f53\u5df2\u7ecf\u5230\u5bb6\u4e86\u3002
could\u548cshould\u505a\u731c\u6d4b\u8bed\u6c14\u7684\u65f6\u5019 could\u7684\u8bed\u6c14\u6bd4should\u66f4\u80af\u5b9a
eg\uff1a"The answer could be right.\u201c\u7684\u8bed\u6c14\u5c31\u6bd4"The answer should be right."\u80af\u5b9a
should\u60c5\u6001\u52a8\u8bcd\u4f5c\u4e3a\u63a8\u6d4b \u662f\u6309\u5e38\u7406\u63a8\u6d4b \u8fd1\u4e8e\u4e8b\u5b9e \u591a\u8868\u793a\u201c\u7406\u5e94\u201d\u505a\u4ec0\u4e48
should和could有读音、意思、用法及语境三种不同之处。具体如下：
1、读音不一样
should：英 [ʃʊd]、美 [ʃʊd]。
could： 英[kəd] 、美 [kʊd] 。
2、意思不一样
should：应该;将会;可能;本应
could：“can”的过去式;能够，打算。
3、用法及表达的语境不一样
should：与动词原形连用，即可作为情态动词，又可作为助动词。
例句：Should we call the doctor?
我们叫医生来好吗？
could：用于假设语气的条件句;用于虚拟语气的结论句，只能作为情态动词。
例句：Our daughter could walk when she was nine months old.
我们的女儿九个月大就会走路了。
参考资料来源：百度百科-should
参考资料来源：百度百科-could
1. can (could)
1）表示能力，could主要指过去时间。
Two eyes can see more than one. 两只眼比一只眼看得清。
Could the girl read before she went to school? 这女孩上学前能识字吗？
2）表示可能（理论上或是逻辑判断上）。
The temperature can fall to –60℃, that is 60℃ below freezing.
气温可降至—60℃，也就是零下60℃。
He can´t (couldn´t) have enough money for a new car. 他不可能有足够的钱买新车。
You mustn´t smoke while you´re walking around in the wood. You could start a fire.
在林子里走时勿吸烟，那样可能会引起火灾。
3）表示允许。
Can I have a look at your new pen? 我可以看一看你的新钢笔吗？
He asked whether he could take the book out of the reading—room.
他问他可不可以把书带出阅览室。
4）表惊异、怀疑、不相信等态度。主要用于否定句、疑问句或感叹句中。
Where can (could) they have gone to? 他们会去哪儿了呢？
He can´t (couldn´t) be over sixty. 他不可能超过六十岁。
How can you be so careless? 你怎么这么粗心？
5）比较委婉客气地提出问题或陈述看法。
Can (Could) you lend me a hand? 帮我一把好吗？
I´m afraid we couldn´t give you an answer today. 恐怕我们今天不能给你答复。
2. may (might)
1）表允许，might可以指过去时间，也可指现在时间，语气更委婉。
You may take whatever you like. 你喜欢什么就拿什么。
He told me that I might smoke in the room. 他告诉我可以在房间里抽烟。
May (Might) I ask for a photo of your baby? 我可以要一张你宝宝的照片吗？
在回答以may引起的问句时，多避免用这个词，而用其它方式，如Yes, please. / Certainly.
/ Please don´t ./ You´d better not. / No, you mustn´t.等，以免显得太严峻或不客气。
2）表可能（事实上）。可以指过去时间，也可以指现在时间，但语气更加不肯定。
He may be at home. 他可能在家。
She may not know about it. 她可能不知道这件事。
He was afraid they might not agree with him. 他担心他们可能不同意他的意见。
They might be having a meeting, but I´m not sure. 他们有可能在开会，不过我不肯定。
3. must
1）表示义务。意为“必须”（主观意志）。
We must do everything step by step. 我们一切都必须循序渐进地做。
You mustn´t talk to her like that. 你不可能那样对她说话。
--Must we hand in our exercise—books now? 我们现在就要交练习本吗？
--No, you needn´t. / No, you don´t have to. 不必。（这种情况下，一般不用mustn´t）
2）表示揣测。意为“想必、准是、一定”等，只用于肯定句。
He must be ill. He looks so pale. 他准是病了。他的脸色苍白。
She´s wearing a diamond necklace. She must have a lot of money. 她戴着钻石项链，一定很有钱。
4. shall
1）表征询意见，用于第一、第三人称疑问句。
Shall I get you some tea? 我给你点茶好吗？
Shall the boy wait outside? 让那男孩在外面等吗？
What shall we do this evening? 我们今晚做什么？
2）表说话人的意愿，有“命令、允诺、警告、决心”等意思，用于第二、第三人称陈述句。
You shall do as I say. 按我说的做。（命令）
You shall have my answer tomorrow. 你明天可以得到我的答复。（允诺）
He shall be sorry for it one day, I tell you. 有一天他会后悔的，我告诉你。（警告）
Nothing shall stop us from carrying out the plan. 什么也不能阻止我们执行这项计划。（决心）
5. will
1）表意愿，用于各种人称陈述句。
I will do anything for you. 我愿为你做任何事。
None is so blind as those who won´t see. 不愿看的人眼最瞎。
If you will read the book, I´ll lend it to you. 如果你愿意读这本书，我会把它借给你。
2）表请求，用于疑问句。
Will you close the window? It´s a bit cold. 请你把窗户关上好吗？有点冷。
Won´t you drink some more coffee? 再来一点咖啡好吗？
3）表示某种倾向或习惯性动作。
Fish will die out of water. 鱼离开水就不能活。
The door won´t open. 这门打不开。
The boy will sit there hour after hour looking at the traffic go by.
那男孩常常坐在那里好几个钟点，看着车辆行人通过。
6. should
1）表义务。意为“应该”（某件事宜于做），用于各种人称。
You should be polite to your teachers. 你对老师应该有礼貌。
You shouldn´t waste any time. 你不应该浪费时间。
2）表推测，意为“想必一定、照说应该、估计”等。
The film should be very good as it is starring first—class actors.
这部新电影是一流演员主演的，估计拍得很好。
They should be home by now. 照说他们现在应当已经到家了。
7.would
1）表意愿。
They would not let him in because he was poorly dressed. 他们不让他进去因为他衣着破旧。
I said I would do anything for you. 我说过我愿意为你做任何事。
2）表委婉地提出请求、建议或看法。
Would you like another glass of beer? 再来杯啤酒好吗？
Would you mind cleaning the window? 请把窗户擦一下好吗？
They wouldn´t have anything against it. 他们不会有什么反对意见。
3）表过去反复发生的动作或过去的一种倾向。
Every time she was in trouble, she would go to him for help.
她每遇到麻烦都会向她求助。他告诉我盒子打不开了。
（二）情态动词后跟完成式和进行式的用法
1.情态动词后跟完成式，表“应当已经……”，“想必已经……”，“本来可以……”等意。
I should have finished the work earlier. 我应当早一点完成这项工作的。
He isn´t here. He must have missed the train. 他还未到，一定是没赶上火车。
Where can (could) he have gone? 他能到那里去了呢？
You may (might) have read about it. 你可能在报上已经读到这件事了。
You could (might) have been more careful. 你本来可以更细心的。
He needn´t have worried about it. 他本不必为此事担心。
There was a lot of fun at yesterday´s party. You ought to have come, but why didn´t you?
昨天的聚会非常有意思。你本应该来，为何不来呢？
2. 情态动词后跟进行式，表示“想必正在……”，“可能正在……”，“应当正在”等意。
It´s twelve o´clock. They must be having lunch. 现在是十二点。他们一定正在吃饭。
They may be discussing this problem. 他们可能正在论讨这个问题。
He can´t be telling the truth. 他说的不可能是真话。
She shouldn´t be working like that. She´s still so weak. 她不应当那样干，她身体仍那么虚。
（三）几组词的辨异
1. can 和be able to
1）情态动词can只有两种时态形式，现在式can和过去式could，而be able to有多种时态形式。
Mary can play the piano. She has been able to play it since she was 5.
玛丽会弹钢琴。她五岁起就会弹了。
2）用在过去时中，could经常表示能够做某事，事实上不一定去做，而was∕were able to则表示“过去做成了某事”。在否定句中两者可通用。
He could swim across the English Channel. But he didn´t feel like it that day.
他能游过英吉利海峡，但那天他不想游。
Yesterday I was able to get home before the heavy rain. 昨天我在下大雨前赶到了家里。
2. must和 have to
must表示主观意志，而have to表示由于客观因素不得不做某事。must没有过去式，除在间接引语中可用于表示过去时间，在直接引语中表示过去时间应该用had to代替。
I told her that she must give up smoking. 我叫她必须戒烟。
We had to get everything ready that night. 我们那晚得把一切准备就绪。
3. would和used to
1）used to表示过去与现在或过去某时与后来的情况有不同，而would只表过去的情况。
People used to think that the earth was flat.
过去人们认为地球是平的。（现在人们不这么认为。）
She would go out for a walk in the morning when she was in the country.
在乡下时，她总是在早晨去散会儿步。（可能现在仍有散步的习惯。）
2）used to可表示过去的习惯动作和经常的情况，而would只表示过去的习惯动作。
He used to ∕would smoke while writing. 过去他写东西时常抽烟。
She used to be fat. 她过去很胖
could是“可以”在给人建议时，是供人参考用，（对自己的建议也不是很有信心是一定可以时用）语气较为温和。should是“应该”，带有命令的感觉。
1. can (could)
1）表示能力，could主要指过去时间。
Two eyes can see more than one. 两只眼比一只眼看得清。
Could the girl read before she went to school? 这女孩上学前能识字吗？
2）表示可能（理论上或是逻辑判断上）。
The temperature can fall to –60℃, that is 60℃ below freezing.
气温可降至—60℃，也就是零下60℃。
He can´t (couldn´t) have enough money for a new car. 他不可能有足够的钱买新车。
You mustn´t smoke while you´re walking around in the wood. You could start a fire.
在林子里走时勿吸烟，那样可能会引起火灾。
3）表示允许。
Can I have a look at your new pen? 我可以看一看你的新钢笔吗？
He asked whether he could take the book out of the reading—room.
他问他可不可以把书带出阅览室。
4）表惊异、怀疑、不相信等态度。主要用于否定句、疑问句或感叹句中。
Where can (could) they have gone to? 他们会去哪儿了呢？
He can´t (couldn´t) be over sixty. 他不可能超过六十岁。
How can you be so careless? 你怎么这么粗心？
5）比较委婉客气地提出问题或陈述看法。
Can (Could) you lend me a hand? 帮我一把好吗？
I´m afraid we couldn´t give you an answer today. 恐怕我们今天不能给你答复。
2. should
1）表义务。意为“应该”（某件事宜于做），用于各种人称。
You should be polite to your teachers. 你对老师应该有礼貌。
You shouldn´t waste any time. 你不应该浪费时间。
2）表推测，意为“想必一定、照说应该、估计”等。
The film should be very good as it is starring first—class actors.
这部新电影是一流演员主演的，估计拍得很好。
They should be home by now. 照说他们现在应当已经到家了。
结合对比：
1.could和should做猜测语气的时候 could的语气比should更肯定
eg："The answer could be right.“的语气就比"The answer should be right."肯定
但是 具体的应用却要看语境 这就比较难判断了
2.should情态动词作为推测 是按常理推测 近于事实 多表示“理应”做什么
以句子为例 There should (chould错) be any difficulty about passing the road tese since you have practiced a lot in the driving school.（同学，顺便提请一下.....any后应该用difficulties）
就表示“你练习了那么多，路考理应没有任何困难的通过.”
It's 7o'clock ，jack should be here at any moment.
为什么不用could？明显的 已经七点了，按语境，jack随时会到这，或者说“理应”随时到这时 should就比could肯定语气强烈。
所以这类题目结合语境很重要 若是表示“可能”就用could ”理应”就用should
回答者：teacher068
can (could)
1）表示能力，could主要指过去时间。
Two eyes can see more than one. 两只眼比一只眼看得清。
Could the girl read before she went to school? 这女孩上学前能识字吗？
2）表示可能（理论上或是逻辑判断上）。
The temperature can fall to –60℃, that is 60℃ below freezing.
气温可降至—60℃，也就是零下60℃。
He can´t (couldn´t) have enough money for a new car. 他不可能有足够的钱买新车。
You mustn´t smoke while you´re walking around in the wood. You could start a fire.
在林子里走时勿吸烟，那样可能会引起火灾。
3）表示允许。
Can I have a look at your new pen? 我可以看一看你的新钢笔吗？
He asked whether he could take the book out of the reading—room.
他问他可不可以把书带出阅览室。
4）表惊异、怀疑、不相信等态度。主要用于否定句、疑问句或感叹句中。
Where can (could) they have gone to? 他们会去哪儿了呢？
He can´t (couldn´t) be over sixty. 他不可能超过六十岁。
How can you be so careless? 你怎么这么粗心？
5）比较委婉客气地提出问题或陈述看法。
Can (Could) you lend me a hand? 帮我一把好吗？
I´m afraid we couldn´t give you an answer today. 恐怕我们今天不能给你答复。
should
1）表义务。意为“应该”（某件事宜于做），用于各种人称。
You should be polite to your teachers. 你对老师应该有礼貌。
You shouldn´t waste any time. 你不应该浪费时间。
2）表推测，意为“想必一定、照说应该、估计”等。
The film should be very good as it is starring first—class actors.
这部新电影是一流演员主演的，估计拍得很好。
They should be home by now. 照说他们现在应当已经到家了。
could和should做猜测语气的时候 could的语气比should更肯定
eg："The answer could be right.“的语气就比"The answer should be right."肯定
should情态动词作为推测 是按常理推测 近于事实 多表示“理应”做什么
SHOULD 用来表示建议或是提供意见 例: You have a test tomorrow, you should study for it. 你明天有考试, 你应该学习. (建议你为了考试要学习) 例: You shouldn't smoke so much. 你不该抽那麼多的烟. (建议你为了健康不要抽烟 ) COULD 是 CAN 的过去式. 1) 用来形容在过去的可能性: 例: I could watch TV everyday when I was a kid but now I can't. 当我是个小孩时 我能天天看电视, 但是现在我不能. 2) 形容在过去的能力: 例: John could run 5 miles when he was young. 在他年轻时, John 能够跑5英里. 3) 用来要求: 例: Could I talk to you? 我能跟你说话吗? 这里也能用CAN: Can I talk to you? 但是COULD比CAN听起来比较礼貌.分享给你的朋友吧：人人网新浪微博开心网MSNQQ空间 对我有帮助 54回答时间：2010-1-20 09:05 | 我来评论 向TA求助 回答者： MeteorGray | 四级采纳率：24% 擅长领域： 英语翻译 英语考试 恋爱 动漫 参加的活动： 暂时没有参加的活动 提问者对于答案的评价： 谢谢。您回答的很全面。 相关内容 2008-9-7 should与could的区别 25 2009-3-23 could have done something 与 should have done something有什么区别？ 5 2007-7-6 shall should may might can could must虚拟语气的用法与区别比较 33 2008-3-14 could和should的用法区别 19 2008-7-14 could 跟 should 有什么区别 更多关于could和should区别的问题>> 查看同主题问题： should could 区别 等待您来回答2回答5一个女生唱的里面有几句是you should know what you are,money can buy..2回答If you want to be hospitable，you should make sure your guests ar....1回答20跪求珠海图文频道的一首英文歌，男生唱的，其中一句歌词好像是you sho....2回答10翻译中文，比较通俗易懂Perhaps one should not merely sprinkle the ....1回答When you make this decision, you should know,then you have lost m....0回答could和should不同.0回答Maybe you should leran to relax这篇文章的翻译 人教八年级下册的.0回答We should respect food and think about the people who don’t have....更多等待您来回答的问题>>转发到： sdn47一级我的提问 我的回答 积分商城 人中心
表允许，might可以指过去时间，也可指现在时间，语气更委婉。
You may take whatever you like. 你喜欢什么就拿什么。
He told me that I might smoke in the room. 他告诉我可以在房间里抽烟。
May (Might) I ask for a photo of your baby? 我可以要一张你宝宝的照片吗？
在回答以may引起的问句时，多避免用这个词，而用其它方式，如Yes, please. / Certainly.
/ Please don´t ./ You´d better not. / No, you mustn´t.等，以免显得太严峻或不客气。
2）表可能（事实上）。可以指过去时间，也可以指现在时间，但语气更加不肯定。
He may be at home. 他可能在家。
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