YOU SAID:

Summer just left the room

INTO JAPANESE

夏が部屋を出た

BACK INTO ENGLISH

The summer left the room.

INTO JAPANESE

夏は部屋を出た。

BACK INTO ENGLISH

I left the room in the summer.

INTO JAPANESE

私は夏に部屋を出た。

BACK INTO ENGLISH

I left the room in the summer.