Collective nouns as singular or plural?

English as a Second Language English Vocabulary, Grammar and Idioms
1

Quote:

“Collective nouns are sometimes counted as one unit (that is, considered to be singular) and sometimes counted separately (that is, considered to be plural). Army, herd, pack, and family are all collective nouns.”

Can someone explain what “counted separately” means. Can I have examples of collective nouns that are singular and plural.

2

These pages might be useful:

grammar-monster.com/lessons/ … e_noun.htm
chompchomp.com/terms/collectivenoun.htm

3

Can I have examples of collective nouns that are singular and plural?

e.g. team, audience, family, jury, committee etc.