Answers - Subject-verb agreement 1a. Did you know a famous...

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Subject-verb agreement 1a. Did you know a famous animal-rights activist has criticized horseracing because of the dangers involved? The subject is one activist and the singular verb is "has" Subject-verb agreement 2b. Peer editing academic papers requires critical-thinking skills and diplomacy. The subject refers to one group of people, therefore, the verb form "requires" is correct. Subject-verb agreement 3a. Vitamins that are sold in a health-food store are not regulated by the Food and Drug Administration.
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The subject is plural, vitamins, and the verb must be plural too, "are" is correct. Using regular and irregular verbs 4a. John has become a rather good actor. The verb became is only used when speaking in the past tense and this is not a past tense sentence. Using regular and irregular verbs 5a. Some athletes have taken drug tests to prove they are not on steroids. The verb "took" is the past tense and this sentene is not a past tense sentence. Using regular and irregular verbs 6b. I laid my book on the table, but now I cannot find it. This sentence discusses something done in the past tense and the verb "laid" is past tense.
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Using the correct form of be and have in the present tense 7b. I am interested in working on the presidential campaign if the opportunity still exists. Because the person currently is interested they are not speaking about a time in the past when they were interested and the verb "am" is correct. Verb form and verb tense
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Answers - Subject-verb agreement 1a. Did you know a famous...

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