Grammar refers to the system of rules that impose the formal structure of writing. In other words, grammar rules provide the foundation that should guide all your speech and writing. Since you're building a foundation, be sure to start with your Grammar Tools for English. This Guide for Grammar in Writing can act as the blueprint help you stay on track, but be sure to avoid the 5 Most Common Grammatical Errors, as well as Misplaced Modifiers and Double Negative Trouble as these errors can bring your grammatical structure tumbling to the ground. Once you have all the rules under your belt, you can teach your friends too and then use our guide to English Grammar Rules for Possessive Plurals to learn how to describe your grasps' of grammar.