A sentence’s subject must agree in number with its verb. Thus, singular
verbs should be used for singular subjects, and plural verbs should be used
for plural subjects.
➲ In each of these sentences, the singular subject is underlined, and the
singular verb is italicized.
Sam holds the school record for the mile run.
This woman knows that subject very well.
Kara performs with the local dance company.
➲ In each of these sentences, the plural subject is underlined, and the
plural verb is italicized.
These two seniors hold the record for the mile run.
These women know that subject very well.
They perform with the local dance company.

Fact
When the Black Death swept across England one theory was that cats caused the plague. Thousands were slaughtered. Ironically, those that kept their cats were less affected, because they kept their houses clear of the real culprits, rats.      .. More >>