The sentence that “the truck and the car are racing down the interstate.” has a proper subject-verb agreement.
What is subject-verb agreement?
The subject-verb agreement means that if a subject is singular, the verb must be singular as well; if the subject is plural, the verb must be plural as well. In terms of number, subjects and verbs must agree (singular or plural).
In the given sentence, it is the subject-verb agreement because the phrase “and” makes this a multiple subject, the plural verb “are” must be used instead of the singular “is.” So they're both speeding down the highway.
Therefore, the given sentence is correct.
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