Collective nouns are used with a verb in the singular or in the plural according to the sense. Such nouns are the following:
staff | /stɑːf/ |
council | /ˈkaʊns(ə)l/ |
family | /ˈfamɪli/ |
class | /klɑːs/ |
public | /ˈpʌblɪk/ |
army | /ˈɑːmi/ |
navy | /ˈneɪvi/ |
government | /ˈɡʌv(ə)nˌm(ə)nt/ |
crew | /krəʊ/ |

Collective nouns
The are refer to things or people as a group – class, family, crew or team.
A bloat of hippopotamuses | A flight of stairs |
A chest of drawers | A hive of bees |
A herd of elephants | A cackle of hyenas |
A school of fish | A gaggle of geese |
A convoy of tanks | A range of mountains |
A colony of ants | A nest of birds | A board of directors | A gang of thieves |
A flock of birds | An orchestra of musicians |
A circle of friends | A parliament of owls |
A class of students | A swarm of locusts |
A fleet of ships | A pride of lions |
A murder of crows | A mob of kangaroos |
A bunch of bananas | A litter of kittens |