YOU SAID:

I don't think you're capable

INTO JAPANESE

私はあなたが有能だとは思わない

BACK INTO ENGLISH

I don't think you are competent

INTO JAPANESE

そんなはず ないだろ

BACK INTO ENGLISH

I don't think you are.

INTO JAPANESE

そんなはず ないだろ

BACK INTO ENGLISH

I don't think you are.