The singular noun is proof.
The word proof is also a verb and an adjective.
jewish priests
analysis itself is a singular form
The noun form 'cut' is singular; the plural form is 'cuts'.
The noun genius is the singular form, the plural form is geniuses.
The singular possessive form of criterion is criterion's
The possessive form of the plural noun proofs is proofs'.Example: I'm waiting for the proofs' delivery from the printer.
The singular form of the demonstrative pronoun 'these' is this.
The singular form of "that" is "it."
Evidence does not have a plural form, as it is an uncountable noun. It is like information, or furniture, or even news, which, in spite of the final -s is always singular. So, you can have "a piece of evidence", or "pieces of evidence", but not "evidences".
The singular form is cuff.
it is already in its singular form.
"Stratum" is the singular form of stratum. The plural form is "strata".
The form hypothesis is the singular form. The plural form is hypotheses.
A singular form of dice is a die
The singular form of feet is foot.
The singular form of Oases is, Oasis.
"Wash" is the singular form of "wash."