Both the singular and plural form is corps; the singular or plural possessive is corps'.
The plural of corps (pronounced kor), meaning a division of an army forming a tactical unit; branch or department of an army e.g. Army Medical Corps, Adjutant General's Corps; an organised body, group of people working more or less together is corps (pronounced korz)
Singular. Corpses is plural.
The word corp is not a word in English. With a period added, corp. is the abbreviation for corporation or corporal. With an 's' added to the end of the word, corps is a noun for a main subdivision of an armed force in the field, consisting of two or more divisions and a a group of people who work together to do a particular job, such as the press corps or diplomatic corps. The noun corps is both the singular and the plural.
It is singular.
See Merriam Dictionary Link for answer. Corps is both singular and plural. Also it is prounounced with a silent "s". If you tried to make it plural using 'es', it comes out "corpses" which refers to cadavers or dead bodies. http://www.merriam-webster.com/dictionary/corps
It is corp. Plural form abbreviation of Corporations is "Corps."
The word crises is a plural word; it is the plural form of the word crisis.
Yes, the word corps is a common, abstract, uncountable noun; a word for a part of an army that has particular responsibilities (the medical corps); a group of people who work together to do a particular job (the press corps); a word for a thing.
There is no plural word for if.
The plural word for delay is delays.
A non-plural word, a word (noun or pronoun) that is not plural is singular, a word for just one.