suitable
"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.
Example sentences:The ship has docked, it arrived yesterday.This horse is very gentle, it is suitable for children to ride.A cat ran up my tree and it can't get down.
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)
The word singular is an adjective. Adjectives do not have singular or plural forms; adjectives have comparative forms: positive: singular comparative: more singular superlative: most singular
The noun 'horsemen' is a plural, common, compound, concrete noun; the plural form of the singular noun 'horseman', a word for a person.
It's not really correct to use the plural 'their' when you mean the singular 'his' or 'hers'. However, English does not, unfortunately, have a singular possessive pronoun for someone whose gender is not known. So 'their' is used to get round the problem. Someone needs to coin a suitable word. I'm surprised they haven't already.
Quantum is singular, not singular possessive. The singular possessive form is quantum's.
singular
I AM, You (singular) ARE, He/She/It IS . . . . . Plural We/You/They ARE
Fruit is singular. Fruits is plural.
No one is a pronoun and is singular.
Atrium is singular - the plural is atria.