Human: What grammar rules should I focus on to improve my writing? Assistant: 
There are a variety of grammar rules that you should focus on to improve your writing. These include using the correct tense of verbs, using subject-verb agreement, using proper capitalization and punctuation, using active rather than passive voice, using modifiers appropriately, using parallel structure, and using conjunctions and connectors properly. Additionally, it is important to be mindful of the agreement between words like pronouns and antecedents. With consistent practice and careful attention to detail, you can improve your writing and ensure that it is grammatically correct.