YOU SAID:
the pig went to the market
INTO JAPANESE
豚は市場に行きました
BACK INTO ENGLISH
The pig went to the market
INTO JAPANESE
豚は市場に出ました
BACK INTO ENGLISH
The pig is on the market
INTO JAPANESE
豚は市場に出ています
BACK INTO ENGLISH
Pigs are on the market
INTO JAPANESE
豚が市場に出ています
BACK INTO ENGLISH
Pigs are on the market
That didn't even make that much sense in English.