Estar frío
To be cold (objects and places ONLY)
Estar caliente
To be hot (also objects and places ONLY)
Estar de viaje
To be about to travel
Estar de compras
To be about to shop
Estar de vacaciones
To be on vacation
Estar de buen humor
To be in a good mood
Estar de mal humor
To be in a bad mood
Estar de acuerdo con…
To agree with…
Estar en falta
To be at fault