YOU SAID:
Don’t forget a jacket
INTO JAPANESE
ジャケットも忘れずに
BACK INTO ENGLISH
Don't forget your jacket
INTO JAPANESE
ジャケットを忘れないでください
BACK INTO ENGLISH
don't forget the jacket
INTO JAPANESE
ジャケットを忘れないでください
BACK INTO ENGLISH
don't forget the jacket
That didn't even make that much sense in English.