I always go with Lucas's and then use Lucas' as the singular possessive. As for plural Lucas possessive, I just try to avoid those scenarios. I wouldn't use Lucas's'. That just looks ridiculous.
Some plural nouns that end with 'os' are:avocadosbanjosbarriosbongosechosegosflamingosghettosgigoloshaloshobosJellokangaroolassologosnachospatiosphotospianospiccolosradiosrhinossolosstudiostacostattoostriosvideoszeroszoos
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."
Some words ending in o that form their plural by adding s only include: pianos, duos, solos, tacos.
To form the plural of words ending in a consonant, simply add -s to the end of the word. For words ending in -ey, remove the -ey and add -eys to make the plural form.
No, nouns ending in 's' are not always plural; some examples are:abacusabyssaddressasparagusbassbiasbonusbuscactuscallouscampuscircusclasscompasscosmosdaisdiabetesdiscusdressemphasisethosficusfocusfungusgasgeniusglassgrasshaggishepatitishiatushibiscushippopotamushummusibisisthmuskisslasslenslossmantismessmetropolismolassesmossnemesisnexusnucleusoasisoctopusonusosmosispantsparenthesispasspelvisphysicsplatypuspluspressprogresspusradiusrhesusruckussassafrassisstatusstratusstresssuccesssurplussynopsistennisTexastrellistrussviruswalruswatercresswellnesswitnessyes
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."
Two plural words ending in '-s':table > tableschair > chairs
As with other words ending in consonant-Y, the plural is BURGLARIES.
Some plural nouns that end with 'os' are:avocadosbanjosbarriosbongosechosegosflamingosghettosgigoloshaloshobosJellokangaroolassologosnachospatiosphotospianospiccolosradiosrhinossolosstudiostacostattoostriosvideoszeroszoos
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.
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.
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.
As with most words ending with 'y', the plural is made by dropping the 'y' and adding 'ies' — so 'melodies' is the plural.
To form the plural of words that end in "z," we usually double the "z" and add "es." For example, the plural of "buzz" is "buzzes." The plural of "whiz" is "whizzes."
It takes a plural verb. example, His mathematics are weak.