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Read many kinds of literature including books, magazines, newspapers and poetry. Reading is the best way to confront challenging topics, pick up vocabulary and writing techniques, and discover new material to bring to the classroom. Depending on the grade you teach, you should be familiar with the most important works in literary history. And you should always be able to give reading suggestions to your students.  As well as reading important literature, read for fun. Remember why you love reading, and encourage your students to do the same. Be aware of current trends in reading material, and try out the things you think your students might be reading. This will help you better understand their interests and relate to them outside the classroom, which will make you a more effective teacher overall. Make a point of looking up new words that you come across in your reading. Study your favorite words and begin to amass a large vocabulary. Challenge yourself to think about words you don't know. Guess at their etymology, and use similar words to figure out their meaning. Don't be afraid to look up words that you're unsure about, and encourage your students to do the same.  At the same time, teach your students that the mark of a good writer isn't just whipping out two-dollar words and using them to sound sophisticated. Teach your students the difference between using a word to draw a historical comparison, or using an alliterative word, and using a word to impress someone with your learning. There are more and less useful ways of wielding words. Never talk down to your students for not knowing or understanding a word. Let them know, "It's alright, that's a difficult word." Then, use a synonym, provide them with context clues, or help them look it up so that they become familiar with a more advanced vocabulary. Students need to be able to read your handwriting so that they can understand notes you take on the whiteboard or feedback you give on an essay. Write letters or keep a journal to keep your handwriting alive and healthy, and always focus on readability rather than the speed of your writing. Make sure you have a firm grasp of spelling, punctuation, and grammar. You don't want to find yourself teaching your students mistaken or wrong information. Use reference books and the Internet as sources for grammar and punctuation rules, and don't be afraid to look up topics you're not sure about.
Read regularly. Expand your vocabulary. Practice your handwriting. Develop your English language skills.