出典:Tatoeba
I don't really understand what you want to say.
I couldn't understand your explanation clearly.
You haven't understood anything about what I explained.
I am sorry that I didn't understand your intentions correctly.
I have no confidence I will explain that to you correctly.
I can't understand what you're saying.
I couldn't correctly understand what you said.
I can't understand what you want to say.
I cannot understand what you are saying.
I can't understand what it is you want to say.
I can't comprehend what you are saying.
I can't understand what you are saying.
I do not understand the content of your instructions.
Sorry, I did not really understand your concern.
You don't need to explain--I understand!
I cannot understand the meaning of what you are saying.
I don't know what I should say to you.
I do not understand your instructions.