YOU SAID:
I consider myself fluent at english
INTO JAPANESE
私は自分が英語に堪能だと思っています
BACK INTO ENGLISH
I think I'm fluent in english
INTO JAPANESE
私は英語に堪能だと思います
BACK INTO ENGLISH
I think i am fluent in english
INTO JAPANESE
私は英語が堪能だと思います
BACK INTO ENGLISH
I think i am fluent in english
You've done this before, haven't you.