Subject verb agreement

Information from Khalid. 


*((subject verb agreement police ))
plural nouns that do not end in -sor–
es, e.g. police, cattle, people, sheep, fish,
Staff, faculty, require plural verbs.

Those people are from Canada.
The police have been called.

*((FISH OR FISHES))
"Fish" is one of those odd words that's usually both singular and plural—like "deer" and (in Canada) "beer." So we can say:
We caught five fish.
We saw three deer.
We Canadians drank six beer. (See my additional comments in the continuation of this post.)

But we can use "fishes" when we are talking about different species:

The fishes of the Fraser River include salmon and sturgeon.