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A verb must agree in number with its subject. A singular subject must be matched with a singular verb and a plural subject with a plural verb.
Words that come between the subject and the verb—called interrupting words—can create confusion. These word groups can make a singular subject look plural, or a plural subject look singular, and can lead to subject-verb agreement problems.
A group of words that modifies a subject can make a singular subject look plural. For example, we might not be sure whether to use a singular or a plural verb in the following sentence:
Because the plural word wolves is next to the verb, we might think that we need a plural verb: wolves howl. But the true subject is pack, not wolves. Of wolves is a prepositional phrase modifying the subject pack. Because the subject pack is singular, the verb should be howls:
Here are some more examples of sentences with confusing word groups between the subject and its verb:
Don’t be fooled by phrases such as along with, in addition to and together with. They can also make subjects look plural. However, the words that follow these phrases are not part of the true subject.
Here are some examples:
A group of words that modifies a subject can also make a plural subject look singular.
Here are some examples:
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