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Re: When subject is a collective unit, singular or plural ?
In the U.S., we seem to have more of a tendency to use the singular verb. If, for some reason, you are going to the trouble of defining them as individuals, then you could see the plural.
I believe that the plural form shows up more often in BrE.
(You also need to use an article with "Client" and "Department.")
When subject is a collective unit, singular or plural ? 
Linear Mode
