Somethings to avoid Do not try to impress people by using words most people have never heard of or with strong tone. Do not use colloquial speech, slang, or" words or phrases. Do not use contractionsSomethings to avoid Do not try to impress people by using words most people have never heard of or with strong tone. Do not use colloquial speech, slang, or "childish" words or phrases. Do not use contractions