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Australian manual of scientific style Start communicating effectively
Within a clause, the subject and verb are expected to ‘agree’ in number: if the subject is singular, the verb should be singular; if the subject is plural, the verb should be plural:
My clock [singular noun] is [singular verb] fast.
All the clocks [plural noun] are [plural verb] fast.
Verbs used with pronouns that refer back to a previous noun should also agree with it:
An ant is [singular] exploring the kitchen benchtop. It [singular] is going in all directions.
Ants are [plural] on the march in my kitchen. They [plural] are swarming all over.
Collective nouns can take singular or plural agreement. Generally:
The department is responsible for the update.
Our university has an excellent research record.