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Subjects and verbs must AGREE with one another in number (singular or plural).  Thus, if a subject is singular, its verb must also be singular; if a subject is plural, its verb must also be plural.
Here are some examples of subject verb agreement (the subject is bolded and the verb underlined): 
My dog always growls at the postal carrier
.Basketballs roll across the floor.I don’t understand the assignment.
These clothes are too small for me.
Peter doesn’t like vegetables.
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Subject verb agreement simply means the subject and verb must agree in number. This means both need to be singular or both need to be plural.
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