The rule for making nouns ending an 'f' sound into the plural from is to drop off the 'f' and add 'ves'. Some examples are:
"eys" like "monkeys" "keys" etc. the only exception is "monies"
Some plural nouns that end with 'os' are:avocadosbanjosbarriosbongosechosegosflamingosghettosgigoloshaloshobosJellokangaroolassologosnachospatiosphotospianospiccolosradiosrhinossolosstudiostacostattoostriosvideoszeroszoos
No, nouns ending in 's' are not always plural; some examples are:abacusabyssaddressasparagusbassbiasbonusbuscactuscallouscampuscircusclasscompasscosmosdaisdiabetesdiscusdressemphasisethosficusfocusfungusgasgeniusglassgrasshaggishepatitishiatushibiscushippopotamushummusibisisthmuskisslasslenslossmantismessmetropolismolassesmossnemesisnexusnucleusoasisoctopusonusosmosispantsparenthesispasspelvisphysicsplatypuspluspressprogresspusradiusrhesusruckussassafrassisstatusstratusstresssuccesssurplussynopsistennisTexastrellistrussviruswalruswatercresswellnesswitnessyes
Two plural words ending in '-s':table > tableschair > chairs
Some plural words ending in "o" are photos, pianos, casinos, and zoos.
To make words ending in "is" plural, change "is" to "es" at the end of the word. For example, "analysis" becomes "analyses," and "thesis" becomes "theses."
As with other words ending in consonant-Y, the plural is BURGLARIES.
For an English plural, the answer is never. Some words ending in the letter 's' are made plural by adding 'es', such as one bus, two buses or one class, two classes.
The usual plural form for words ending in -f or -ef is to drop the f and add ves. There are exceptions to this rule where only an s is added to the end of the words.
The correct plural of wharf is wharves.Wharves, following the general rule of changing the final f to v when making plurals of words ending in f (or fe).
Because there is no standard rule for words ending in -o.
The plural of infirmity is infirmities. For most words ending in y, change it to i and add es.