Write complete sentences . Every sentence must have a nominative and a predicate. Subjects and verbs must agree in number . Use the past tense for historical narrative. Avoid improper shifting of verb tenses in sentences.
Active voice identifies the person initiating or responsible for the action.
Pronouns must agree in number with their antecedents. Do not split infinitives. Do not use contractions in formal writing . Since you will not use contractions, you should use apostrophes only to show possession. It's always means it is .