Knowing basic grammar is important in order to be able to analyze and improve your language performance. Understanding the use of noun, verbs, adverb, adjective, phrase or clause helps you to write English better. For example, to write a letter, you need to know the rule of sentence structure, the rule of words order like OPSHACOM. Further more, writing requires a lot of mental effort. Most English learners do their writing tend to make mistake and misuse of grammar rules, which are very easy to recognize.

Knowing basic grammar is an important tool for readers to understand what they are reading. It is considered to be a handle of literature. News, stories or poems have a lot of long sentence. Using grammar to defind which one is subject, verb, object, phrase or adverbial clause. By analyzing the grammar of sentences and paragraphs, the readers can understand what they read better.