关于could与can的问题 could和can的用法区别，could在什么情况下用
can\u4e0ecould\u7684\u533a\u522b\u4e00\u3001\u60c5\u6001\u52a8\u8bcdcan\u7684\u7528\u6cd5
1. \u8868\u793a\u80fd\u529b\uff0c\u610f\u601d\u662f\uff1a\u80fd\uff0c\u4f1a\u3002\u5982\uff1a
I can't swim. \u6211\u4e0d\u4f1a\u6e38\u6cf3\u3002
Can you drive\uff1f \u4f60\u4f1a\u5f00\u8f66\u5417\uff1f
2. \u8868\u793a\u5ba2\u89c2\u53ef\u80fd\u6027\uff0c\u610f\u601d\u662f\uff1a\u53ef\u4ee5\uff0c\u53ef\u80fd\u3002\u5982\uff1a
That big cinema can seats 2,000 people. \u90a3\u5bb6\u5927\u7535\u5f71\u9662\u80fd\u57502000\u4eba\u3002
He can be very friendly at times. \u6709\u65f6\u4ed6\u4f1a\u5f88\u53cb\u597d\u3002
3. \u8868\u793a\u5141\u8bb8(\u548cmay\u610f\u601d\u76f8\u8fd1)\uff0c\u610f\u601d\u662f\uff1a\u53ef\u4ee5\uff0c\u80fd\u591f\u3002\u5982\uff1a
You can have the book when I have finished it. \u4e66\u6211\u770b\u5b8c\u4e86\u53ef\u4ee5\u7ed9\u4f60\u3002
Can I use your pen\uff1f \u6211\u53ef\u4ee5\u7528\u4f60\u7684\u94a2\u7b14\u5417\uff1f
4. \u8868\u793a\u60ca\u5f02\u3001\u4e0d\u76f8\u4fe1\u7b49\uff08\u7528\u4e8e\u7591\u95ee\u53e5\u3001\u5426\u5b9a\u53e5\u6216\u611f\u53f9\u53e5\u4e2d\uff09\uff0c\u610f\u601d\u662f\uff1a\u4f1a\uff0c\u53ef\u80fd\u3002\u5982\uff1a
This can't be true. \u8fd9\u4e0d\u53ef\u80fd\u662f\u771f\u7684\u3002
Can it be true\uff1f \u8fd9\u53ef\u80fd\u662f\u771f\u7684\u5417\uff1f
\u4e8c\u3001\u60c5\u6001\u52a8\u8bcdcould\u7684\u7528\u6cd5
1. \u8868\u793a\u201c\u80fd\u529b\u201d\u6216\u201c\u53ef\u80fd\u6027\u201d\uff0c\u4f5c\u4e3acan\u7684\u8fc7\u53bb\u5f62\u5f0f\u3002\u5982\uff1a
Could you speak English then\uff1f \u90a3\u65f6\u4f60\u80fd\u8bb2\u82f1\u8bed\u5417\uff1f
He said he couldn't follow me. \u4ed6\u8bf4\u4ed6\u8ddf\u4e0d\u4e0a\u6211\u3002
2. \u8868\u793a\u60ca\u5f02\u3001\u6000\u7591\u3001\u4e0d\u76f8\u4fe1\u7b49\u60c5\u7eea\u3002\u5982\uff1a
Who could have taken them\uff1f \u8c01\u4f1a\u628a\u5b83\u4eec\u62ff\u8d70\u4e86\u5462\uff1f
She couldn't have left so soon. \u5979\u4e0d\u53ef\u80fd\u8fd9\u4e48\u5feb\u5c31\u8d70\u4e86\u3002
\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0ccould\u548ccan\u662f\u53ef\u4ee5\u6362\u7528\u7684\uff0c\u7528could\u65f6\u53e3\u6c14\u8f83\u7f13\u548c\uff0c\u7528can\u65f6\u4e0d\u76f8\u4fe1\u7684\u7a0b\u5ea6\u66f4\u5f3a\u4e00\u4e9b\uff0c\u4e24\u8005\u5728\u65f6\u95f4\u4e0a\u6ca1\u6709\u5dee\u522b\u3002
3. \u6bd4\u8f83\u59d4\u5a49\u5ba2\u6c14\u5730\u63d0\u51fa\u95ee\u9898\u6216\u9648\u8ff0\u770b\u6cd5\u3002\u5982\uff1a
\u2014Could you let me have your passport?
\u2014Yes, here it is.
\u2014\u770b\u770b\u4f60\u7684\u62a4\u7167\u597d\u5417\uff1f
\u2014\u884c\uff0c\u8fd9\u5c31\u662f\u3002
I could come earlier, if necessary. \u5982\u679c\u5fc5\u8981\u6211\u53ef\u4ee5\u65e9\u70b9\u6765\u3002
\u8fd9\u65f6could\u548ccan\u6ca1\u6709\u65f6\u95f4\u4e0a\u7684\u5dee\u522b\u3002
4. \u5728\u865a\u62df\u6761\u4ef6\u53e5\u4e2d\u6784\u6210\u8c13\u8bed\u3002\u5982\uff1a
I would certainly do it for you if I could. \u8981\u662f\u6211\u80fd\u505a\u5f97\u5230\uff0c\u6211\u4e00\u5b9a\u4f1a\u4e3a\u4f60\u4eec\u505a\u8fd9\u4e8b\u513f\u3002
How I wish I could go with you! \u6211\u591a\u4e48\u5e0c\u671b\u548c\u4f60\u4eec\u4e00\u9053\u53bb\uff01
can\u7684\u8fc7\u53bb\u5f0f\u662fcould\uff0c\u4f46could \u9664\u4e86\u53ef\u4f5ccan\u7684\u8fc7\u53bb\u5f0f\u5916\uff0c\u8fd8\u53ef\u8868\u6bd4can\u66f4\u59d4\u5a49\u7684\u8bed\u6c14\uff0c\u56e0\u6b64\u5728\u56de\u7b54\u7531could \u8868\u793a\u8bf7\u6c42\u7684\u95ee\u53e5\u4e2d\uff0c\u4e0d\u80fd\u7528could\uff0c\u4f46\u53ef\u7528can\u3002\u5982\uff1a
\u2014Could you lend me a hand?
\u2014Of course I can.
2，这种情况下，can和could是情态动词，两者其实并没有关系，不是现在时和过去时的关系，就是两个独立的词，一般用在要求别人帮忙或猜测事情的时候。could you do me a favor?是属于要求人家帮忙，如果原意就说sure/certainly/yes, i'd love to类似这种；如果不愿意帮忙，sorry,but...后面接一些原因之类的。
要人家帮忙也可以用can you do me a favor?只不过用could比can更委婉客气。
1)问题怎么问就怎么回答
所以用yes ,you could。
但应该是yes ,he could
2) 问题现在问，就以现在式回答
所以是yes, I can
第一点要注意
英语并不是语法对， 句子就成立了
还要看逻辑性和习惯性用法的
could he play the guitar ?
单独的，这句话就不成立， 所以如何回答已经没有意义了
表委婉语气时 如could you please do me a favor?回答时用甚麽 ？ 那就要看会答的人要表达甚麽了
例子
yes, i would - 我会帮忙的
it depends on what you want - 看你需要甚麽帮忙了
yes, i could -
yes, i can
could you please do me a favor?
要回答:sure 而不是 yes i can-太没礼貌了。
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