Tīnɡdǒnɡ le mɑ?
听懂了吗?
Do you understand?
Notes:
听(tīnɡ): to listen
懂(dǒnɡ): to undersatnd
了(le): particle word
吗(ma): question word
Example:
A: 听懂了吗?
Tīnɡdǒnɡ le mɑ?
Do you understand?
B:听懂了。
Tīnɡdǒnɡ le.
Yes.