El hermano es el profesor.

Breakdown of El hermano es el profesor.

ser
to be
el profesor
the teacher
el hermano
the brother

Questions & Answers about El hermano es el profesor.

Why do we use el before hermano?
In Spanish, nouns have a gender. The word hermano ends in -o, which usually means it is a masculine noun. Because it is masculine and singular, we use the masculine word for the, which is el.
The word profesor does not end in -o. How do we know to use el with it?
Many masculine nouns that refer to people end in a consonant, like the -r in profesor. Since it refers to a male teacher, it is masculine and takes the masculine article el.
How would this sentence change if we were talking about a sister?
You would change the masculine words to feminine words and use the feminine article la. The sentence would become La hermana es la profesora. Notice that to make a profession ending in a consonant feminine, you simply add an -a to the end.
I remember learning that we drop the article before professions. Why is el used before profesor here?
It is true that when simply stating what someone does for a living, you leave out the article, like in El hermano es profesor (The brother is a professor). But here, we are identifying him as a specific person: he is the exact professor we are talking about. When you say the professor, you must include el or la.

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