Identity and classification
Who or what is it, and which group does it belong to?
Meaning
We can identify someone or something by name or say what kind of person or thing it is. This can point to one particular person or thing, or place it in a group such as teachers or birds. Some languages connect the two parts with a verb, while others have no such verb or leave it out in some sentences. Unlike State and existence, this block names or classifies something rather than describing its condition, location, or existence.
How to spot it
Look for a part that answers who or what someone or something is, rather than what they do or what condition they are in.
In your native language
English uses a form of be before a name or noun to say who or what someone or something is. A singular noun for one member of a group normally needs a/an if it names something that can be counted. To identify a particular person or thing, English can use a name or a phrase such as the new teacher.
This is Emma.
A name identifies a particular person; no article is used before Emma.
Leo is a driver.
A driver places Leo in a group; the singular job noun needs a.
That building is the library.
The library identifies which building it is.
In your learning language
Spanish uses ser to identify someone or something or say which group they belong to. Ser changes form to match the subject, even when the statement names a role rather than an action. Unmodified job labels usually have no article, while descriptions such as una profesora excelente normally have one.
Soy Elena.
I'm Elena.
Carmen es profesora.
Carmen is a teacher.
The unmodified job label profesora has no article.
Esto es una tarjeta de transporte.
This is a transit card.
The noun group places the object in a category.
Learners whose language omits a linking verb in identity statements may leave out ser. Learners whose language requires an article before job labels may add one where Spanish normally uses a bare noun.