1.pardon,please.意思是麻烦重复一遍，一般老外就会再说一遍，并且会很慢。

2.sorry,i can't understand what u said, my english is poor(not good也可以)

3.sorry, i am not good at english, could u speak slowly?意思就是我英语不好，你可以讲慢些么？