33c Make verbs agree with compound subjects.

Subjects joined by and generally require a plural verb form.

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When subjects joined by and are considered a single unit or refer to the same person or thing, they take a singular verb form.

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In this sentence, drinking and driving is considered a single activity, and a singular verb is used.

If the word each or every precedes subjects joined by and, the verb form is singular.

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With subjects joined by or or nor, the verb agrees with the part closer or closest to the verb.

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If you find this sentence awkward, put the plural noun closer to the verb: Either the defendant or the witnesses are lying.