YOU SAID:
I'm pretty sure this is wrong
INTO JAPANESE
私はこれが間違っていると確信しています
BACK INTO ENGLISH
I'm sure this is wrong
INTO JAPANESE
これは間違っていると思います
BACK INTO ENGLISH
I think this is wrong
INTO JAPANESE
これは間違っていると思います
BACK INTO ENGLISH
I think this is wrong
You've done this before, haven't you.