YOU SAID:

When I was young I killed a fish

INTO JAPANESE

若い頃、私は魚を殺した

BACK INTO ENGLISH

When I was young, I killed the fish

INTO JAPANESE

私が若い頃、私は魚を殺した

BACK INTO ENGLISH

When I was younger, I killed the fish

INTO JAPANESE

私が若くて魚を殺した

BACK INTO ENGLISH

I was young and killed the fish

INTO JAPANESE

私は若かったし、魚を殺した

BACK INTO ENGLISH

I was young and killed the fish