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Match singular subjects with singular verbs, plural subjects with plural verbs (I run, she runs, they run).
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Amounts of time and money are usually singular (ten dollars is).
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Either/or and neither/nor: Match the verb to the closest subject (neither the boys nor the girl is).
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Either and neither, without their partners or and nor, always take a singular verb (either of the apples is).
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All subjects preceded by each and every take a singular verb (each CD is mine; every one of the cheeses is different).
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Both, few, several, and many are always plural (both/many are qualified; few want the job; several were hired).