These.
The word teeth is the plural version of the word tooth.
It is just full. There is no actual plural form
"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.
Xenopes or xenopses, either is correct.
I believe that the pluralized version of the word gulf is just gulfs.
Singular. "Porpoises" is the pural version of porpoise.
pixaxe is the singular version, pickaxes is the plural version.
'Multiple' is a singular word in its own right. 'Multiples' is the plural word. NOT 'multiplies' , this is a mathematical operation.