Museum is singular. Museum's is singular possessive. Museums is plural. Museums' is plural possessive.
Other's is singular possessive. Others' would be the plural possessive
Volcanoes is plural. The singular would be volcano and the possessive would be volcano's.
People's is plural possessive. That is because people is plural, so the 's is added. The singular possessive would be person's.
The singular possessive is Maddox's. The plural possessive would only be used if there was a group of people all having the name Maddox, which would be Maddoxes'.
The form toys' is the plural possessive form of the singular noun toy.Example: The toys' box is full to the brim.The possessive form of the singular noun toy is toy's.Example: The toy's action made the baby smile.
The plural of "oasis" is "oases."
No, "catalogs" is not singular possessive. Singular possessive would be "catalog's" with an apostrophe before the "s" at the end.
The word community is singular; the plural form is communities.
No. Men is plural.
I would have to answer all three, depending upon which context the term is meant to be conveyed.
Nieces' is the plural possessive form of the noun niece. The singular possessive form would be niece's.
The singular possessive form is evening's. The plural possessive form is evenings'.