Formal and Informal (A particular area of study)

For many students’ instance, they constantly are confusing how to select appropriate words into a formal or academic essay. From the subject of recognizing formal and informal, it seems that most of formal words are more complex than informal words, but formal sentences are usually more concise than informal words instead. Furthermore, grammatical use should be observed carefully, as well as using passive tense is more formal than active one. Nevertheless, it is important to consider the structure and organization before the sentences have been written.