Yes the word question is a singular noun.
The plural noun is questions.
Yes, "question" is a singular noun.
The noun mailbox is the singular form; the plural is mailboxes.
The singular noun is "louse" and the plural noun is "lice."
The noun sash is the singular form. The plural noun is 'sashes'
"Book" is a noun that has both a singular and plural form: "book" (singular) and "books" (plural).
Yes, "vest's" is the singular possessive form of the noun "vest."
The possessive form for the singular noun calf is calf's (just as you have it in your question).
The noun question is singular; the plural form is questions. Two or more questions will end with an 's' and are plural.
If you have a question. I answer many questions.When you need an answer, I provide many answers.
Yes. Hay is a singular noun. A Singular noun means one item only. So technically, hay is a singular noun.
The noun 'theory' is a singular noun. The plural noun is 'theories'.
The noun 'mice' is the plural form of the singular noun 'mouse'.
The noun 'fun' is a singular non-count noun, it has no plural form.
An example of a singular noun for a school could be "institution."
The noun juggler is a singular noun. The plural noun is jugglers.
Feet is a plural noun. Foot is a singular noun.
The noun family is the singular form; the plural form is families.
Yes, "friend" is a singular noun. It refers to an individual who is supportive, caring, and trustworthy in a personal relationship.