Can v/s May - Modal Auxiliary Verbs in English Grammar

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'May' and 'Can' both may/can also be used to get permission:
See the Examples:

1. May I use your pen?
    Can I use your pen?

2. How may I help you?
    How can I help?

3. May we go to play?
    Can we go to play?

Watch the following video in Gujarati for the use of 'May' & 'Can' got permission:

Little more about...

Can : 

Can is used for ...

Ability of Muscles or Man Power:
Ability of Money Power:
Ability of Mind Power:

(Click here for detail)

May :

May is used for ...

Possibility.
Permission.
Blessing:

(Click here for detail)

Best of Luck!