Criterion is the singular form.
Criteria is plural. The singular form is criterion.
Criteria is plural. Criterion is singular. The criteria to pass a maths exam is being able to add up and subtract. The criterion of passing an addition exam is being able to add up.
Criteria is a plural. The singular is criterion, of which the possessive is criterion's. The PLURAL possessive is criteria's.
Criterion is the singular form of criteria.
Criteria is already a plural - it is used incorrectly as a singular. The singular is criterion.
The singular form of "criteria" is "criterion." So, "criterion is" would be proper, as would "criteria are." "Criteria is" or "criterion are" would not.
Criteria is plural. Criterion is singular. Don't mess with Latin!
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.