No.
They are all the same singular.
The singular form of the demonstrative pronoun 'these' is this.
The singular form of "that" is "it."
"Stratum" is the singular form of stratum. The plural form is "strata".
A singular form of dice is a die
The singular form of Oases is, Oasis.
The word "macaroni" is a plural noun. The singular form of it is "macarono."
The plural form for the singular noun macaroon is macaroons.The plural form for the singular noun macaroni is macaronis.
The singular form of the demonstrative pronoun 'these' is this.
The singular form of "that" is "it."
it is already in its singular form.
The singular form is cuff.
"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.
The singular form of chromosomes is a chromatid.