ESTAR (to be) is a very useful verb to learn. Here is a list of some idioms / expressions with ESTAR:
| Estar a sus anchas | to be comfortable |
| Estar mojado hasta los huesos | to be soaked to the skin |
| Estar como un pez en el agua | to be right at home |
| Estar con el alma en un hilo | to be in suspense |
| Estar de más | to be in excess |
| Estar en condiciones | to be in good condition / be able |
| Estar en la luna | to have ones head in the clouds |
| Estar en las nubes | to be daydreaming |
| Estar fuera de sí | to be beside oneself emotionally |
| Estar hecho polvo | to get worn out |
| Estar hecho una fiera | to get furious |
| Estar hecho una sopa | to get soaked |
| Estar loco de remate | to be completely crazy |
| Estar loco de remate | to be completely crazy |
| Estar sin blanca | to be flat broke |
| Estar de vacaciones | to be on holidays |
| Estar de viaje | to be travelling |
| Estar de pie | to be standing |
| Estar de rodillas | to be kneeling |
| Estar de moda | to be in fashion |
| Estar de acuerdo | to be agree |
| Estar de vuelta | to be back |
| Estar de luto | to be in mourning |
| Estar bien | to be ok / well |
| Estar nublado | to be cloudy |
| Estar despejado | to be clear (weather) |