YOU SAID:

Why was there a guy that bought 20 cans of corn?

INTO JAPANESE

トウモロコシの 20 缶を買った男があったはなぜですか。

BACK INTO ENGLISH

Had a man bought 20 cans of corn, why?.

INTO JAPANESE

男はなぜ、トウモロコシの 20 缶を買っていたか。

BACK INTO ENGLISH

Or why the man had bought 20 cans of corn.

INTO JAPANESE

または、なぜ男はトウモロコシの 20 缶を買っていた。

BACK INTO ENGLISH

Or why the man had bought 20 cans of corn.