Open is a verb and verbs only have a singular form for present tense third person singular subjects (he / she / it ) or singular noun subjects.
The third person singular form is verb + -s ie opens.
He opens the shop everyday.
The teacher opens the class room at 8:00am
The singular form is cow an archaic plural for cow is kine
ewe sheep
The possessive form for the singular noun guest is guest's.Example: I'm expecting my guest's arrival any time now.
The plural form of tomato is tomatoes.
Adjectives such as the word "any" are the same whether used to describe a singular or plural noun.
Graffiti originated in Italy and was found in the ruins of Pompeii. In archaeology it refers to an ancient drawing scratched on a wall or any surface. In the singular form, the word is graffito.
Yes, the noun 'chairs' is a common noun, the plural form of the singular noun 'chair'; a general word for a type of furniture; a word for any chairs of any kind.The word 'chairs' is also the third person, singular of the verb to chair.
The word 'softball' is a common, compound, singular noun. The word 'game' is a common, singular noun.The term 'softball game' can be considered a noun phrase(any word or group of words based on a noun or pronoun, without a verb) or an open spaced compound noun (the noun softball and the noun game joined to form a word with a meaning of its own).
The singular of any lice is louse.
The noun 'artists' is a common, concrete noun; the plural form of the singular noun 'artist'; a word for a person who practices any of the creative arts.
The possessive form for the singular noun guest is guest's.Example: I'm expecting my guest's arrival any time now.
Yes, the word 'classes' is a common noun, the plural form of the singular noun 'class', a general word for any classes of any kind. The word 'classes' is also the third person, singular, present of the verb class ( class, classes, classing, classed).