YOU SAID:
Dumbledore isn't the best at science
INTO JAPANESE
ダンブルドアは科学が一番得意ではない
BACK INTO ENGLISH
Dumbledore isn't the best at science.
INTO JAPANESE
ダンブルドアは科学が得意ではありません。
BACK INTO ENGLISH
Dumbledore is not good at science.
INTO JAPANESE
ダンブルドアは科学が苦手です。
BACK INTO ENGLISH
Dumbledore is not good at science.
You've done this before, haven't you.