The noun genius is the singular form, the plural form is geniuses.
analysis itself is a singular form
The noun form 'cut' is singular; the plural form is 'cuts'.
Yes, apple is the singular; the plural form is apples.
The singular possessive form of criterion is criterion's
Addendum is the singular form; the plural form is addenda, although there is some acceptance for addendums as the plural.
The noun genius is the singular form, the plural form is geniuses.
genius
The possessive form of the singular noun toy is toy's.example: The toy's inventor was a genius.
Singular possessives of nouns always use the apostrophe S regardless of their spelling.The possessive would be genius's (e.g. a genius's IQ is very high).
The singular form of the demonstrative pronoun 'these' is this.
The singular form of "that" is "it."
The singular form of "cuffs" is cuff.
The singular form of "stratum" is "stratum." The word does not change in its singular form.
The singular form of feet is foot.
The singular form of scissors is "scissor."
The singular form of diagnoses is diagnosis.
The singular form of "wash" is "washing."