YOU SAID:

I was in school and then I threw

INTO JAPANESE

私は学校にいて、それから投げました

BACK INTO ENGLISH

I was in school and then threw

INTO JAPANESE

私は学校にいてから投げました

BACK INTO ENGLISH

I threw from school

INTO JAPANESE

学校から投げた

BACK INTO ENGLISH

Thrown from school

INTO JAPANESE

学校から投げられた

BACK INTO ENGLISH

Thrown from school