YOU SAID:

The world was young the mountains green

INTO JAPANESE

世界は若かった、山は緑だった

BACK INTO ENGLISH

The world was young, the mountains were green

INTO JAPANESE

世界は若く、山は緑だった

BACK INTO ENGLISH

The world was young and the mountains were green.

INTO JAPANESE

世界は若く、山は緑でした。

BACK INTO ENGLISH

The world was young and the mountains were green.