YOU SAID:

My mom thinks that i can speak in 7 different languages

INTO JAPANESE

私のお母さんは7つの言語で話せると思っています。

BACK INTO ENGLISH

I think my mom can speak 7 languages.

INTO JAPANESE

私のお母さんは7つの言語を話すことができると思います。

BACK INTO ENGLISH

I think my mom can speak 7 languages.