DIRECTRESS
The word data is already plural. The singular form of the word data is datum.
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The word 'phenom' is a slang or informal form for the noun, short for phenomenon (the plural for is phenomena, an irregular plural).Since the use of the word 'phenom' is relatively modern, the plural form can be a regular plural: phenoms.
The word 'criteria' is the plural form of the singular word 'criterion'. 'Those are the criteria that I used in making my decision.' 'That is the criterion that I used in making my decision.' It is wrong to use the word 'criteria' as a singular. Similarly, it is wrong to use 'phenomena' as a singular. It is the plural form of the singular word 'phenomenon'.
The demonstrative pronoun and the adjective use of the word 'these' is the plural form of 'this'.
Gentleman usher is two word. To make the plural of that term, you have to use the plural form of both words; so it would become gentlemen ushers.
There are several meanings to the word 'calculus.' The plural for calculus is 'calculi.' There is no plural for the calculus we use in mathematics.
To use plural in a sentence, you simply have to modify the noun to indicate that there is more than one of that particular thing. For example, instead of saying "cat," you can say "cats" to refer to multiple cats. Verbs and pronouns may also need to be adjusted to agree with the plural subject.
It is seldom necessary to use the word Harry in a plural form, but if such a situation arises, the plural is Harry's. This should not be confused with harries, which is a verb.
'Des' is actually the plural form of the word "a". If you are saying anything in the plural form and want to use the in from of it, you have to use "des."
The word 'neither' is a conjunction which doesn't have a plural or possessive form. The word 'neither' is an adjective which doesn't have a plural or possessive form. The word 'neither' is an adverb which doesn't have a plural or possessive form. The word 'neither' is an indefinite pronoun meaning not one and not the other of two or more people or things. There is no plural or possessive form for saying 'not one or the other'. The pronoun 'neither' can take a singular or plural verb form, depending on use.
Yes, the noun 'understanding' is a count noun as a word for an informal agreement.The plural form is understandings.The noun 'understanding' is an uncountable noun as a word for the ability to comprehend or sympathy for others' feelings.This use has no plural form.