YOU SAID:

i sat on a chair and the chair went plop

INTO JAPANESE

私は椅子に座って椅子が落ちました

BACK INTO ENGLISH

I sat on a chair and the chair fell

INTO JAPANESE

椅子に座って椅子が落ちた

BACK INTO ENGLISH

Sitting on a chair and the chair fell

INTO JAPANESE

椅子に座って椅子が落ちた

BACK INTO ENGLISH

Sitting on a chair and the chair fell