Many believe music doesn't belong in the school system. However, music increase activity in student's brains and are shown to be beneficial and needed for brain growth.
In order to find out the subject-verb agreement, you need to be able to identify "the simple subject" of your sentence first. The subject and verb must agree in number: both must be singular, or both must be plural.
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Do you mean his real job? it doesn’t specify but we for sure know that mr.x isn’t smuggling body’s, most likely he works in an office