In English sentences, the form of the verb is partly determined by the subject of that verb, specifically by the person and number of the subject. The following table provides examples of sentences that follow the rules of agreement between subject and verb that are part of normal English usage. You'll see that, basically, verb forms are marked to signal whether their subject is 1st, 2nd or 3rd person, and to signal whether the subject is singular or plural. These are rules that you know quite intimately as a speaker of English; for example, you would never make a mistake in normal speech and say something like 'I is a biologist'.
Notice that the form of the verb in these examples also signals the tense of the verb. ie. the time frame of the action, either past, present or future.
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