Copula (linguistics) - Meanings

Meanings

Predicates formed using a copula may express identity – that the two noun phrases (subject and complement) have the same referent or express an identical concept:

I only want to be myself.
The Morning Star is the Evening Star.

They may also express membership of a class, or a subset relationship:

She was a nurse.
Dogs are carnivorous mammals.

Similarly they may express some property, relation or position, whether permanent or temporary:

The trees are green.
I am your boss.
The hen is next to the cockerel.
The children are confused.

Other special uses of copular verbs are described in some of the following sections.

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