The word 'their' is a plural pronoun, a word that takes the place of a plural noun or pronoun, or two or more nouns or pronouns.
The pronoun 'their' is a possessive adjective, a word placed before a noun to describe that noun as belonging to two or more people or things.
Examples:
The boys are riding their bicycles. (the bicycles of the boys)
What are the kinds of pronouns and their functions? (the functions of pronouns)
Jack and Jill went up the hill with their bucket. (the bucket of Jack and Jill)
practitioner is singular (plural practitioners)sofa is singular (plural sofas)satellite is singular (plural satellites)clips is plural (singular clip)dentist is singular (plural dentists)dollars is plural (singular dollar)article is singular (plural articles)magazines is plural (singular magazine)laminator is singular (laminators is plural)radios is plural (singular radio)
singular and plural
Singular: book / Plural: books Singular: cat / Plural: cats Singular: child / Plural: children Singular: foot / Plural: feet
Are is plural. "Is" is singular. For example, "There is a glove on the chair". That is singular. "There are gloves on the chair". That is plural.
"Has" is singular, e.g. He has, she has. "Have" is plural, e.g. They have, we have. The exception is "I" - e.g. I have.
The word team is singular; the plural form is teams.
Who may be singular or plural.
This is singular. These is the plural form.
These is plural, this is singular
'These' is the plural form of 'this'.
diagnosis is singular diagnoses is plural sis = singular ses = plural
"Notebook" is singular. The plural form is "notebooks."