寒い
The room is cold.
部屋が寒いです
The room is cold in the morning.
朝は部屋が寒いです
My room is cold in the morning.
朝は私の部屋が寒いです
Because there's no heater, my room is cold in the morning.
ヒーターがないので朝は私の部屋が寒いです
Because there's no heater, my room is very cold in the morning.
ヒーターがないので朝は私の部屋がとても寒いです