It is just full. There is no actual plural form
These.
The word teeth is the plural version of the word tooth.
"Obstacles" is a plural word. Its singular version is "obstacle". Ray
There's no such word as davide, did you mean divide? The plural of divide is divides.
"is" plural version is "son"
Examples: He is annoying. They are annoying. We are annoying. You are annoying. There's not a plural version of the word.
Lis pendens is considered a singular and plural version of the word. You would NOT spell it "lis pendenses" as the plural. You simply use the same word as singular and plural.
The plural version of "mother" is "mothers." This form simply adds an "s" to the end of the word, following standard English pluralization rules.
Xenopes or xenopses, either is correct.
I believe that the pluralized version of the word gulf is just gulfs.
"basketful" is a wrong term or word. you could say "basket full" . The plural form of it would be "baskets full"
Singular. "Porpoises" is the pural version of porpoise.