The singular form in stimulus.
it is already in its singular form.
The form hypothesis is the singular form. The plural form is hypotheses.
The correct plural form of "stimulus" is "stimuli."
The singular is cavity.
The singular form is phenomenon.
The plural for stimulus is stimuli.
stimulus = singlestimuli = plural
plural
"Stimulus" is singular; "stimuli" is plural.
Stimulus can be both singular and plural depending on its usage. As a singular noun, it refers to a single influence or prompt. As a plural noun, stimuli is used to refer to multiple influences or prompts.
Stimulus (singular) and Stimuli (plural)
Because "stimulus" is a Latin word. In Latin, most words ending in "-us" form the plural in "i". They keep this in English.
The singular form of the demonstrative pronoun 'these' is this.
The singular form of "that" is "it."
The singular form is cuff.
it is already in its singular form.
"Stratum" is the singular form of stratum. The plural form is "strata".