Pardon? Sorry, I wasn't paying attention.
I'm sorry, I don't get it.
Could you please say that again?
I am sorry, come again?
I am sorry, could you repeat it?
Could you spell it out?
Could you type that in the Skype's chat box?
Could you say it in another way please?
Could you give me the spelling?
Could you say it in another way please?
Sorry, I still missed that.
I'm good, and how about you?
I'm doing great! Thank you!
maybe（確信度60%）
perhaps 確信度40%
possibly（確信度20%）
