YOU SAID:

Johan is very tiny and not big at all like why would you think that?

INTO JAPANESE

ヨハンはとても小さく、なぜそんなに大きくないと思うのですか？

BACK INTO ENGLISH

Johan is so small, why don't you think he's not that big?

INTO JAPANESE

ヨハンはとても小さいので、なぜ彼はそんなに大きくないと思いませんか？

BACK INTO ENGLISH

Johann is so small, why don't you think he's not so big?

INTO JAPANESE

ヨハンはとても小さいので、なぜ彼はそれほど大きくないと思いませんか？

BACK INTO ENGLISH

Johann is so small, why don't you think he's not so big?