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.
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".
-ing it changes the verb understand into the noun understanding. The 's' is making understand plural.
Leukocytes is the plural of leukocyte
The plural noun is raisins.
The plural of "classification" is "classifications."
The correct plural for the word "wolf" is "wolves."