YOU SAID:

When I was a little lad, I killed many cats.

INTO JAPANESE

私が小さい頃多くの猫を殺した

BACK INTO ENGLISH

When I was little, I killed a lot of cats.

INTO JAPANESE

小さい頃猫をたくさん殺した

BACK INTO ENGLISH

When I was a kid, I killed a lot of cats.

INTO JAPANESE

子供の頃猫をたくさん殺した

BACK INTO ENGLISH

When I was a kid, I killed a lot of cats.