'Estoy triste.'
You need to use the verb 'estar' instead of 'ser' because although they both mean 'to be,' estar is used when you are speaking about a present condition, feeling, or location. Ser is used when speaking about a permanent or essential characteristic. Because you are describing your feelings in this moment, estar must be used.
put a sad face or say u sad from keepmedancin123 on meez.com
Estamos triste.
estoy triste
El pescado es triste = The fish is sad.
ella esta triste
el esta triste
estás triste
im aplastamiento
To say "I'm sad" in Polish, you would say "Jestem smutny" if you are male or "Jestem smutna" if you are female.
Yo im superman
im sobre él
im pidiendo que