nǐ shuō shénme?
What did you say?
请再说一遍
Please say it again
This is a polite request: 请 (qǐng) means 'please', 再 (zài) means 'again', 说 (shuō) means 'say', and 一遍 (yí biàn) is a measure word for 'one time'. So it literally means 'please say one more time'.
请再说一次
qǐng zài shuō yī cì
Please say it one more time. — Uses '一次' (one time) instead of '一遍', making it slightly more casual.
麻烦您再说一遍
máfan nín zài shuō yí biàn
Sorry to trouble you, please say it again. — More polite because it adds '麻烦您' (sorry to trouble you).
再说一遍
zài shuō yí biàn
Say it again. — Shorter and more direct, without 'please'.
你能再说一遍吗?
nǐ néng zài shuō yí biàn ma?
Can you say it again?
当然可以,请再说一遍。
dāngrán kěyǐ, qǐng zài shuō yí biàn.
Of course, please say it again.
Appropriate
Avoid when
You say '请再说一遍' (qǐng zài shuō yí biàn).
It is pronounced 'qǐng zài shuō yí biàn'. Note that '一' is pronounced 'yí' before the fourth tone '遍'.
Use it when you need someone to repeat what they said because you didn't hear or understand. It's polite and suitable for most situations.
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