YOU SAID:
He is so smart that even the teacher didn't know the answer.
INTO JAPANESE
彼はとても頭がいいので、先生でさえ答えを知りませんでした。
BACK INTO ENGLISH
He was so smart that even the teacher didn't know the answer.
INTO JAPANESE
彼はとても頭が良かったので、先生でさえ答えを知りませんでした。
BACK INTO ENGLISH
He was so smart that even the teacher didn't know the answer.
Well done, yes, well done!