The rule that could explain what makes a sentence grammatically correct or not is:
Subject-Verb Consistency or agreement: A sentence must have a singular or plural subject and verb in order to be grammatically correct. To put it another way, the tenses of the subject and verb must match. The verb should be in plural form if the subject is plural (and vice versa).
In a sentence, capitalize the initial letter of the first word. Put a period, question mark, exclamation point, or quotation marks at the end of your sentences. In most sentences, the subject comes first, followed by the verb, and then the objects. subject, verb, and object.
Therefore, Some rules includes:
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