YOU SAID:

There isn't a chair so sit on air.

INTO JAPANESE

椅子は、空気の上に座るがないです。

BACK INTO ENGLISH

There is no Chair will sit on the air.

INTO JAPANESE

空気椅子は座ってないがあります。

BACK INTO ENGLISH

Air Chair is not sitting.

INTO JAPANESE

空気椅子は座っていません。

BACK INTO ENGLISH

Air Chair is not sitting.