The word century's is the possessive form of the singular noun century.
The plural noun is centuries.
The plural possessive form is centuries'.
Example: Several centuries' records were destroyed in the war.
The plural form for the noun louse is lice; the plural possessive is lice's.
The plural possessive of lady is ladies'.
In alphabetical order it would be names singular (no posessive), then 's (possessive), then plural with s endings, then plura-possessive ending in s (with the s' possessive). Example: baby - singular no possessive baby's - singular possessive babies - plural, no posessive babies' - plural possessive
The possessive form of "their" is "theirs."
The plural of 'this' is 'these' and the plural of 'that' is 'those'.
Years'
Uncles'
Painters'
The plural possessive of region is regions'.
The plural form of the noun lynx is lynxes.The plural possessive form is lynxes'.
The plural posessive form is nests'.
singular
The plural form for the noun louse is lice; the plural possessive is lice's.
The knife's edge had been dulled when it hit the rock. Knife's is singular posessive. The knives' edges had been dulled when they hit the rock. Knives' is plural posessive.
Waitresses.
The noun members is the plural form for member; the plural possessive form is members'.
The singular form of the noun is stapler. The singular posessive form of the noun would be stapler's. The plural form of the noun would be staplers. The plural posessive form of the noun would be staplers'