How to ask the other party to repeat what they just said in English?

1. Please say it again. what did you say ?

Please say it again. I don't know what you mean.

"Please say it again, I don't understand."

I'm afraid I don't quite understand you. would you please say that again.

I can't fully understand you. would you please say that again.

Please try again.

Could you say it again, please

5. Please repeat it

would you please say that again.

6. Can you repeat that? Can you say that again?

7. Can you say that again? Can you say that again?

8. Sorry,-

9. I'm sorry-

10. What?

Note: 8.9 Can you repeat the pleasantries after two people have finished speaking? etc

The expressions of 1, 2, 3 need to master common spoken language.