Some nouns refer to groups of people, animals or things:
army
crew
gang
public
audience
enemy
government
regiment
committee
family
group
staff
company
flock
herd
team
We can use these group nouns either as singular nouns or as plural nouns:
My family
is very dear to me.
I have a large family.
They are very dear to me.
The government
is very unpopular.
The government
are always changing
their minds.
Sometimes we think of the group as a single thing:
The audience always
enjoys the show.
The group
consists of two men and three women.
Sometimes we think of the group as several individuals:
The audience clapped
their hands.
The largest group
are the boys.
The names of many organisations and teams are also group nouns, but they are usually plural in spoken English:
Barcelona
are winning 2–0.
The United Oil Company
are putting prices up by 12 per cent.
and the police is always plural:
The police
are offering a £5,000 reward.