The plural for for the compound noun sister-in-law is sisters-in-law.
The rule is that the 'sisters' become multiple, but the relationship 'in-law' does not become multiple, it is still the same relationship to a siblings spouse.
Note that you will hear people say, 'my in-laws'. This term is used when the 'in-laws' are relationships of varying combinations of sister, brother, father, mother-in-law and the abbreviated form is easier to say.
Irregular nouns do not follow the typical rules of adding -s or -es to form plural forms. Irregular nouns may change their spelling completely to form their plural form. Some common irregular nouns include "child" (plural: children), "man" (plural: men), and "woman" (plural: women).
The rules for making plural compound nouns are the same as the rules for making plural nouns. The ending of the word determines the form of the plural. For example:pole to poles; flagpole to flagpolesway to ways; doorway to doorwaysbaby to babies; crybaby to crybabiesbox to boxes; breadbox to breadboxesknife to knifes; jackknife to jackknives
To change a singular noun to its plural form, add -s, -es, or -ies to the end of the word, depending on the spelling rules. Make sure to adjust any accompanying verbs and pronouns to agree with the new plural form.
To form the plural of a word, typically add "s" or "es" to the end of the word. However, there are irregular plural forms where the word changes entirely (e.g. child to children). Use a dictionary or grammar guide for exceptions.
There is no plural form. Do and Do not are verbs
The rules for making proper nouns plural are the same as for making common nouns plural. The plural form is the DaVincis.
Rules of thumb
the word "rules" (in the plural form) cannot take any prefixes.
Well, darling, the plural form of "traffic rule" is "traffic rules." It's not rocket science, honey. Just add an "s" at the end and voilà, you've got yourself a plural. Now go out there and follow those traffic rules like the responsible citizen you are!
Irregular nouns do not follow the typical rules of adding -s or -es to form plural forms. Irregular nouns may change their spelling completely to form their plural form. Some common irregular nouns include "child" (plural: children), "man" (plural: men), and "woman" (plural: women).
The plural form of the noun library is libraries.The plural possessive form is libraries'."Don't forget those libraries' rules."
Possess is a verb. Its plural form (the one used with plural subjects) is possess, while the form used with singular subjects is possesses.Examples:We possess, they possess.He, she or it possesses.The noun form of possess is possession, plural possessions.
The possessive form of the plural noun charters is charters'.Example: All of the previous charters' rules will be reviewed for relevance.
Eros is a proper noun; proper noun use the same rules for plural as common noun. Words ending in ch, sh, z, x, and s add -es to the end of the word to form the plural. The plural form is Eroses.
a cow
The plural of rule is rules.
To change "county" to a plural noun, you would add the suffix "-ies" to the end of the word. Therefore, the plural form of "county" is "counties." This change follows the rules of English pluralization, where certain nouns take specific suffixes to indicate plurality.