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i have a month off from work. i decided to polish up on my english. maybe, spend a lot of time here.

I'm struggling with (can,could) and ( may, might ) when i put it into a sentence.I don't know which one to use. Also, i don't know which one to use between can/could and may. it's so confusing for me. thank you in advance.
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for example:

1) you can have this.

2) you could have this.

3) you may have this.

4) you might have this.

which one is correct? when do i use each one? are they interchangable?

5) can i have this?

6) could i have this?

7) may i have this?

which one is correct? when do i use each one? are they interchangable?
are these silly questions? i'm wondering why i have no response. help, i'm dying to know.
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Hi there,

Could and might both have an implied "if."

If you didn't have dessert after dinner, you could have the candy now.

You might win the race if you practice hard.

There's also a distinction between can and may in that can says you are able to, and may says you have permission to.
i here this sentense a lot. is this correct?

may i have this dance. (sounds like you are asking permission)
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Ulam
I hear (with your ears) this sentence a lot. Is this correct?

May I have this dance? (sounds like you are asking permission)

Hello Ulam

That's correct! You're asking someone to partner you in the dance and you seek his/her permission beforehand. Nobody wants to be dragged kicking and screaming onto the dancefloor against their will!

Yes the modals are a bit complex and looking at how they are used in context is recommended, as you are doing.

Cheers

Murasaki
Thank you.