YOU SAID:

Jerry soon found out he was not alone

INTO JAPANESE

ジェリーはすぐに彼が一人ではないことを知った

BACK INTO ENGLISH

Jerry soon learned that he was not alone

INTO JAPANESE

ジェリーはすぐに彼が一人ではなかったことを学んだ

BACK INTO ENGLISH

Jerry soon learned that he was not alone