Use of Modals: Can | Could

Could you is a very good way of introducing a request? It is an alternative to would you? And a little more polite.
 
Use-of-Modals-Can-Could-in-Hindi

Can Could

 1.  Can एवं Could दोनों का प्रयोग Request हेतु किया जा सकता है। Could से more politeness जाहिर होती है। जैसे:
Can you give me your umbrella? 
Could you lend me your sofa set?
Could you please send me an application form? 

Could you is a very good way of introducing a request? It is an alternative to would you? And a little more polite.  -Thomson, and Martin.

 2.  Could का प्रयोग past ability को व्यक्त करता है। जैसे: 
When I was young, I could climb any tree.
When Ram was young, he could swim across this river. 

 3.  Could का प्रयोग वर्तमान में आवश्यकता (Necessity), क्षमता (ability) के सन्दर्भ में निम्न प्रकार किया जाता है. 
Could you run the business by yourself? (If it becomes necessary.)
Could you get another job?  (If you are terminated from here.)

 4.  Could का प्रयोग present perfect में एक ऐसी past possibility को व्यक्त करता है जो पूर्ण नहीं हुई। जैसे: 
He could have caught the train if he had hurried. (But he didn't catch the train.)
He could have done it without much problem. (But he didn't do it.) 
He could have sent a message. (But he didn't send.)

 5.  Can के past tense के रूप could का प्रयोग होता है। जैसे: 
Ramesh told me that he could lend me his umbrella. 
I did all that I could.

 6.  काल्पनिक (Unreal) conditions में could का प्रयोग निम्न प्रकार होता है 
If I had more money, I could build a temple. 
If I had wings, I could fly to the Himalayas.
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