YOU SAID:

Man sits down on a chair

INTO JAPANESE

男は椅子に座る

BACK INTO ENGLISH

Man sits in a chair

INTO JAPANESE

男は椅子に座っています

BACK INTO ENGLISH

Man sitting in a chair

INTO JAPANESE

椅子に座っている男

BACK INTO ENGLISH

Man sitting on a chair

INTO JAPANESE

椅子に座っている男

BACK INTO ENGLISH

Man sitting on a chair