YOU SAID:

I have eaten a piece of cheese

INTO JAPANESE

チーズを一つ食べたことがある

BACK INTO ENGLISH

I've eaten one piece of cheese.

INTO JAPANESE

私はチーズを一つ食べた。

BACK INTO ENGLISH

I ate one piece of cheese.

INTO JAPANESE

私はチーズを一つ食べた。

BACK INTO ENGLISH

I ate one piece of cheese.