The noun 'theory' is a singular noun. The plural noun is 'theories'.
Theory is a singular noun = 1 theory Theories is a plural noun = more than one theory
The noun 'theory' is a singular, common, abstract noun; a word for a supposition or a system of ideas intended to explain something; a word for a concept.
A noun is a person, place, thing, or idea. I'm guessing that a theory would fall into the idea section.
Yes. Hay is a singular noun. A Singular noun means one item only. So technically, hay is a singular noun.
The noun 'mice' is the plural form of the singular noun 'mouse'.
Yes the word question is a singular noun. The plural noun is questions.
The noun mailbox is the singular form; the plural is mailboxes.
Feet is a plural noun. Foot is a singular noun.
The noun juggler is a singular noun. The plural noun is jugglers.
The noun school is the singular form.The plural noun is schools.
The noun 'fun' is a singular non-count noun, it has no plural form.
The singular noun is "louse" and the plural noun is "lice."