"May I" vs "Can I"

source: Learn English with Let's Talk     2013年12月1日
Using "May I' Vs 'Can I' - English Grammar Lesson
Take the test : http://learnex.in/may-i-vs-can-i-engl...

Many people use the word can when they are asking for permission. They say,
"Can I go to the bathroom?" or "Can I have a box of popcorn?"
There is a better way to ask for permission. Use the word may instead.
"May I go to the bathroom?" or "May I have a box of popcorn?"

Try to use the word may when you are asking for permission.
Try to use the word can only when you are talking about being able to do something.
Examples:
Can Natasha program her laptop to make funny noises?
Yes, she can do many amazing things.

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