No, the word 'committees' is the plural form of the singular noun 'committee'.
Examples:
I'm on the committee to plan the holiday party. (singular)
Ms. Rodgers serves on several congressional committees. (plural)
Committee is singular. Committees is plural.
No, committee is a singular noun. The plural form is committees.
The possessive form for the plural noun committees is committees'.
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'.
Yes the word question is a singular noun. The plural noun is questions.
The noun mailbox is the singular form; the plural is mailboxes.
Committee is singular. The plural form is committees.
Singular: committeePlural: committees
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.