A1 used to show that you agree with something or agree to do something可以的，同意的；能接受的，可行的
A2 used to check that someone understands something or that they agree to something（用于确认某人是否明白或同意某事）明白吗？好吗？
A2 informal used as a way of showing that you are going to take action or start something new（用于表示打算行动或开始新的活动）行，好吧
Okay, let's get going!
OK, is everyone ready?
Okay, today I'm going to tell you a bit about Picasso.
OK, now that everyone's here, we'll sit down.
OK, Stephanie, could you tell us what you've been doing this week?
not standard used in the middle of a sentence as a way of pausing（用于句中起停顿作用）
A2 agreed or acceptable可以的，同意的；能接受的，可行的
"Well okay, perhaps I was a little hard on her, " he conceded.
"Are you sure it's okay for me to use your mother's car?" "Positive."
Don't rock the boat until the negotiations are finished, okay!
"We'll be at your house at round about nine o'clock, okay?"
I'd like to run through a few points with you, if that's okay.
A1 in a satisfactory state or of a satisfactory quality令人满意的；可以的；不错的
A2 not bad but certainly not good还可以的，还行的，凑合的
You look ghastly - are you okay?
Don't panic! Everything will be okay.
Would you pop upstairs and see if Grandad is okay?
I ring home once a week to tell my parents I'm okay.
The doctor says that it's touch-and-go whether Mary will be okay.
A2 in a satisfactory way很好；还不错；还算满意
We managed to find the house OK.
Did you get the work finished okay?
The document printed out okay.
I just need to check that the payment has come through OK.
The house sale seems to be going through OK.
to agree to something同意，接受；批准