YOU SAID:

would be funny if you also bought banana boxes

INTO JAPANESE

バナナの箱も買ったら面白いだろうな

BACK INTO ENGLISH

It would be fun to buy a box of bananas too.

INTO JAPANESE

バナナの箱を買うのも楽しいでしょう。

BACK INTO ENGLISH

Buying a box of bananas can be fun too.

INTO JAPANESE

バナナの箱を買うのも楽しいかもしれません。

BACK INTO ENGLISH

It might be fun to buy a box of bananas.

INTO JAPANESE

バナナを一箱買うのも楽しいかもしれません。

BACK INTO ENGLISH

It might be fun to buy a box of bananas.