YOU SAID:

i have eaten many children

INTO JAPANESE

私はたくさんの子供を食べてきた

BACK INTO ENGLISH

I've eaten a lot of children.

INTO JAPANESE

私はたくさんの子供たちを食べました。

BACK INTO ENGLISH

I ate a lot of children.

INTO JAPANESE

私はたくさんの子供を食びました。

BACK INTO ENGLISH

I ate a lot of children.