The form barracks is both the singular and the plural form. The plural possessive is barracks'.
The form barrack is a verb, to provide soldiers with accommodations; to jeer loudly at someone performing or speaking in public.
The singular possessive form is heart's; the plural possessive form is hearts'.
The plural of rose is roses. The plural possessive is roses'.
The plural form is homes; the plural possessive is homes'.
The plural possessive is regions'.
The plural possessive is governesses'.
There is no simple answer to this question. The best way to know your words (singular or plural, and possessive forms) is to increase your vocabulary (the number of words that you know and recognize).Most plural nouns are formed by adding an "s" to the end of the word (apple, apples; bell, bells).But many plural nouns do not end with an "s" (child, children; foot, feet).Some nouns do not change from singular to plural (one deer, two deer; one aircraft, two aircraft).And some nouns do not have a singular form or a plural form (barracks, oxygen); these are called mass nouns or uncountable nouns.Possessive nouns are indicated by adding an apostrophe s ('s) to the end of the word, or just an apostrophe to the end of a plural noun that ends with an s (s').Examples:apple; The apple's color was bright green. (singular possessive)apples; The apples' colors were red, green, and yellow. (plural possessive)child; A child's coat hung by the door. (singular possessive)children; The children's coats hung in a row. (plural possessive)deer; We saw a deer's footprints in the snow. (singular possessive)deer; The were many deer's footprints in the snow. (plural possessive)barracks; It was my job to scrub the barracks'floor. (singular possessive)barracks; All of the barracks' roofs needed repair. (plural possessive)
Coaster's is singular possessive. The plural is coasters, the plural possessive is coasters'.
The correct form is "its" for the possessive form in the plural. "Its" is used for both the singular and plural possessive forms, without an apostrophe.
The plural is briefs. The plural possessive is briefs'.
The plural is lads. The plural possessive is lads'.
The plural is trollies. The plural possessive is trollies'.
The plural is relatives. The plural possessive is relatives'.
The plural is stations. The plural possessive is stations'.
Museum is singular. Museum's is singular possessive. Museums is plural. Museums' is plural possessive.
The singular possessive form is heart's; the plural possessive form is hearts'.
The plural of rose is roses. The plural possessive is roses'.
The plural form is homes; the plural possessive is homes'.