YOU SAID:
A frog sat on a pink stool
INTO JAPANESE
カエルはピンクの椅子に座っていました
BACK INTO ENGLISH
The frog was sitting on a pink chair
INTO JAPANESE
カエルはピンクの椅子に座っていました
BACK INTO ENGLISH
The frog was sitting on a pink chair
That didn't even make that much sense in English.