Question

Read the following sentence from your lesson and notice the underlined word.
May I stay with you
The underlined word 'may' is a helping verb .it is used to take or give permission in a formal way.
But can is used to take or give permission in a formal way.
can I leave this place (taking permission)
You can go now. (Giving permission)
May has another use also. it is used to express possibility
e.g. It may rain today.
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Answer 1

ɪ ᴅᴏɴ'ᴛ ᴋɴᴏᴡ...........

Answer 2

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May :-

We use may to refer to weak possibility in the present and future: The economy may go up or down in the next year. (I think both are possible, the economy going up or the economy going down. I am not making either one a strong possibility.)

Can :-

used to say that what a person does or feels is understandable or that a person should not be blamed for doing or feeling something.