The plural form of Sioux is Sioux.
The singular form of the demonstrative pronoun 'these' is this.
The singular form of "that" is "it."
The singular form of "stratum" is "stratum." The word does not change in its singular form.
The singular form of "oases" is "oasis."
The plural form of Sioux is Sioux.
Sioux
The singular form of the demonstrative pronoun 'these' is this.
The singular form of "that" is "it."
The singular form of binoculars is "binocular."
The singular form of "cuffs" is cuff.
The singular form of "stratum" is "stratum." The word does not change in its singular form.
The form hypothesis is the singular form. The plural form is hypotheses.
The singular form of feet is foot.
Phenomenon is the singular form of phenomena.
The singular form of chromosomes is a chromatid.
The singular form of "dice" is "die."