YOU SAID:

I have a neighbor who can't speak english if I stop speakign english I will be able to understand him

INTO JAPANESE

英語を話すことができない隣人がいます。

BACK INTO ENGLISH

There is a neighbor who can not speak English.

INTO JAPANESE

英語が話せない隣人がいます。

BACK INTO ENGLISH

There is a neighbor who can not speak English.