Quick answer
Ser names what something is. Estar describes where it is or how it is at a particular moment.
A reliable test is to identify the job of the word before translating from English.
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What each word does
ser
to be for identity
Use ser for identity, origin, time, ownership, definitions, and stable qualities.
estar
to be for state or location
Use estar for temporary conditions, location, ongoing results, and how something is right now.
How to choose
- ser: Choose ser if the sentence points to identity, origin, time, ownership, definitions, and stable qualities.
- estar: Choose estar if the sentence points to temporary conditions, location, ongoing results, and how something is right now.
Examples
Eu sou estudante.
I am a student.
Estou em casa.
I am at home.
Common trap
Do not decide from the English word "be" alone. Ask whether the sentence identifies something or describes a current state.
Practice it in context
Pick one sentence from your real life and write it twice: once with ser, then once with estar. If both versions feel possible, name the meaning shift.
Learn Brazilian Portuguese step by step
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