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The word crises is a plural word; it is the plural form of the word crisis.
There is no plural word for if.
The plural form for the demonstrative pronoun this is these.
A non-plural word, a word (noun or pronoun) that is not plural is singular, a word for just one.
The plural word of delay is delays.
the plural word is comedones
No it's a singular word. A plural word would be "have".
The plural of the word "raisin" is "raisins."
Leukocytes is the plural of leukocyte
The plural of the word "classification" is "classifications."
The plural of the word brush is brushes. As in "she brushes her hair".