The possessive form of the noun group is group's.
example: Our group's standing qualified for the finals.
The plural form of the noun group is groups.The plural possessive form is groups'.example: All of the groups' leaders had to participate in the event.
The possessive form of the word "dictionary" is "dictionary's."
group's
The possessive form is the mirror'sreflection.
The singular possessive form is word's, for example the word's definition.
possessive form of the word glass: glass'
possessive form of the word Congress: Congress'
possessive form for the word holders: holders'
possessive form of the word Cathi: Cathi's
The possessive form of the word fairy is fairy's.
the possessive form of the word Cathie: Cathie's
"Group of children" is considered singular because "group" is the main subject of the sentence, while "children" is a descriptive noun modifying the group. So, you would use singular verbs and pronouns when referring to a group of children.