YOU SAID:
Your mom is so fat she had to buy the whole plane to travel to America instead of a plane ticket
INTO JAPANESE
あなたのお母さんはとても太っているので、アメリカに行くのに航空券の代わりに飛行機を丸ごと買わなければならなかった
BACK INTO ENGLISH
Your mother is so fat that she had to buy a whole plane instead of a plane ticket to go to America.
INTO JAPANESE
あなたのお母さんはとても太っているので、アメリカに行くのに航空券の代わりに飛行機を丸ごと買わなければなりませんでした。
BACK INTO ENGLISH
Your mother is so fat that she had to buy a whole plane instead of a plane ticket to go to America.
That didn't even make that much sense in English.