The document discusses the verb "to be" in English. It provides examples of using "to be" in affirmative, negative, and interrogative forms for the present tense. It also gives examples of using "to be" to describe characteristics, for definitions and classifications, locations, ages, times, and origins. Key uses of "to be" include linking subjects to adjectives, nouns, places, times and more. The document aims to teach English learners the proper uses of the basic verb "to be".