YOU SAID:
The petrol station only opens on Sundays.
INTO JAPANESE
ガソリン スタンドは日曜のみ開きます。
BACK INTO ENGLISH
Gas stations are open only on Sundays.
INTO JAPANESE
ガソリン スタンドは、日曜日のみ開いています。
BACK INTO ENGLISH
Gas stations are open only on Sundays.
That didn't even make that much sense in English.