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.
There are two acceptable plurals - memorandums of understanding and memoranda of understanding.
Leukocytes is the plural of leukocyte
The plural of "classification" is "classifications."
The plural noun is raisins.