考口语时对方提的问题你不会时，怎么说!

sorry,i don't know~

sorry, i have no idea about the question. i will think about it later.

Pardon , my oral english is not very good, but I think I will try my best to change it to up level.

sorry, i don't know the answer~~

LS 的答案都非常好~

对不起，这个，这个，我不知道!!!嘿嘿!!