Uses of Ser and Estar with Adjectives

As a general rule, remember that ser is used with permanent situations, and estar is used with temporary situations. Now, notice how to use ser and estar when they are followed by adjectives.

Ser with Adjectives

We use ser when referring to features that we consider the person, thing, animal, or place owns. We see it like this every day. We do not observe a change. That is, we use ser to define or classify subjects, comparing them with others.

Tu perro es muy juguetón porque todavía es un cachorro.
Your dog is very playful because it's still a puppy.

Eduardo es muy simpáti