There IS a singular and plural
Singular: Referring to only one thing or person.
Plural: a word in the form in which it potentially refers to something other than one person or thing; and other than two things if the language has a dual form.
I think the previous contributor misunderstood your question!
'Their' is plural. It means 'belonging to them', and 'them' is plural.
Colloquially, 'their' is often used to mean 'his or her', which is singular in meaning. But the word 'their' is still plural.
If you had used quotation marks in your question, to indicate that the word 'their' was what you were asking about, you would not have been misunderstood.
"their's" is not actually a word in English. I think you're looking for "theirs" as in "Mike and Kelly own that house. The house is theirs." Theirs is not singular or plural; it just lets the listener/reader know that the house is owned by more than one person (Mike AND Kelly). Possessive pronouns in English rely on the quantity of their antecedent (what they replace). You could easily say "Mike and Kelly bought some eggs. The eggs are theirs."
Now, if you meant "there's" as in "there is a house on the hill", then there is also a numberless pronoun because it can be any number. The phrase "there's" is a contraction of "there" and "is", and because "is" is singular, "there" in this case is singular, too.
You could just as easily, however, say "there're", which Firefox spell check doesn't like, but which I argue is an accurate representation of what speakers of English do, which is to make contractions everywhere! "there're" = "there are" like "there are three fish in the pond".
No, because there are not 100 plural pronouns.The plural pronouns are:weusyou (can be singular or plural)theythemthesethoseouroursyour (can be singular or plural)yours (can be singular or plural)theirtheirsourselvesyourselvesthemselvesbothfewfewermanyothersseveralall (can be singular or plural)any (can be singular or plural)more (can be singular or plural)most (can be singular or plural)none (can be singular or plural)some (can be singular or plural)such (can be singular or plural)
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.
singular Singular: plural is coats
Who may be singular or plural.
Singular
No, because there are not 100 plural pronouns.The plural pronouns are:weusyou (can be singular or plural)theythemthesethoseouroursyour (can be singular or plural)yours (can be singular or plural)theirtheirsourselvesyourselvesthemselvesbothfewfewermanyothersseveralall (can be singular or plural)any (can be singular or plural)more (can be singular or plural)most (can be singular or plural)none (can be singular or plural)some (can be singular or plural)such (can be singular or plural)
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.
singular Singular: plural is coats
The word team is singular; the plural form is teams.
This is singular. These is the plural form.
These is plural, this is singular
Singular
Who may be singular or plural.