The possessive form of the singular noun index is index's.
Indices are indexes, so the singular would be index.
One index Many indices Plural possessive would therefore be indices'.
Him is not possessive. The possessive would be 'his'.
No, he is not possessive. The possessive form would be his.
The singular possessive is biker's; the plural possessive is bikers'.
Women's is a plural possessive. The singular possessive is woman's
The singular possessive is ant's.The plural possessive is ants'.
The possessive form of "he" is "his": He did his homework after dinner.
The singular possessive is "ox's". Another contributor wrote "oxen's", but that is the plural possessive.
The singular possessive is Richard's; the plural possessive is Richards'.
The singular possessive is athlete's. The plural possessive is athletes'.
Possessive nouns (but not possessive pronouns) use apostrophes; therefore, "brother's" is possessive. "Brothers" is plural.