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What is the difference between OK and okay, and should they be used in sentences?

Thank you.
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Hi,

What is the difference between OK and okay, There's no difference, they are just alternative spellings.

and should they be used in sentences? Yes, but remember that this is an informal expression.

Don't use it in formal writing, eg a college essay, a business letter.

We use it very much in speaking, but try to avoid it at times when we are trying to use our best and most formal speaking. eg Don't use it when you talk to the Queen of England.

Best wishes, Clive
Hi,

What about OK vs ok (caopitals and lowercase)?

Thanks

Suse
Capitalize, Suse. The online dictionaries authorize these: OK, O.K., okay. The second is becoming rare.
AnonymousWhat is the difference between OK and okay, and should they be used in sentences?
Thank you.
O.k had been used during the war to report Zero Killed, 0 K(illed) !

Pascal From Finland