The identity copula (เป็น)

The Identity Copula (เป็น)

When you want to say "A is B" where both A and B are nouns—such as equating a person with their profession, status, or relationship—Thai uses the identity copula เป็น.

Place เป็น between the subject and the noun that describes them.

Nationalities

To state someone's nationality, combine the word for person (คน) with the name of the country, such as ไทย. Since this creates a noun phrase, you must use เป็น to link it to the subject.

Family and Relationships

Use this same copula to introduce family members (like พ่อ or แม่) and relationships (like เพื่อน), explaining who they are or what they do.

Nouns vs. Adjectives

It is important to remember that Thai only uses เป็น to connect a noun to another noun. When describing a noun with an adjective (a stative verb), do not use เป็น. The adjective connects directly to the noun.

Notice the difference below between describing the teacher with a direct adjective (no copula) and describing the father with a noun phrase (using the copula):