YOU SAID:

The room is beautiful inside

INTO JAPANESE

部屋は美しい緑

BACK INTO ENGLISH

Room is beautiful.

INTO JAPANESE

部屋は美しいです。

BACK INTO ENGLISH

Room was beautiful.

INTO JAPANESE

部屋はきれいでした。

BACK INTO ENGLISH

The room was clean.

INTO JAPANESE

部屋はきれいだった。

BACK INTO ENGLISH

The room was clean.