What part of speech is “their”

their can also function as an adjective, in which case it indicates possession or belonging.

used in this way, it appears before a noun to show possession and can be either singular or plural. It is also used as an adjective to indicate something belongs to or is done by a group of people.

'Their team won the championship.'

'Their report was submitted on time.'

'Their house is very large.'

it is important to note that grammaticalty it is incorrect to use their as an adjective to refer to a single person. If the referent is a single person, the correct pronoun to use is his or her. However, it's also widely used nowadays as a singular pronoun, to refer to an individual person of unknown or nonbinary gender. Additionally, in formal writing, one should strive to be as specific as possible when using pronouns, and avoid using their if possible.

their is a third person possessive pronoun used to refer to a group of people, animals, or things previously mentioned or otherwise implied.

when referring to people, it can be used instead of his/her or his/hers when addressing a group or when it is unclear to whom the pronoun is referring. In order to use their correctly, the referent must be specified previously in the sentence or understood from the context.

'My American friends celebrated their independence day last month.'

'My siblings love going to the beach, but their favorite activity is swimming.'

it is important to note that grammaticaly it is incorrect to use their as a singular pronoun. If the referent is a single person, the correct pronoun to use is his/her or him/her. However, it's also widely used nowadays as a singular pronoun, to refer to an individual person of unknown or nonbinary gender. Additionally, in formal writing, one should strive to be as specific as possible when using pronouns, and avoid using their if possible.