YOU SAID:

when did you first find that rock?

INTO JAPANESE

その岩を初めて見つけたのはいつですか？

BACK INTO ENGLISH

When did you first find the rock?

INTO JAPANESE

最初に岩を見つけたのはいつですか？

BACK INTO ENGLISH

When was the first rock found?

INTO JAPANESE

最初の岩が見つかったのはいつですか？

BACK INTO ENGLISH

When was the first rock found?