The document discusses the use of "there is/are" in affirmative, negative, and interrogative sentences. It provides examples of using "there is" for singular nouns and "there are" for plural nouns. Examples include questions like "How many pyramids are there?" followed by the answer of "There is one pyramid" or "There are three pyramids". The document also covers the negative forms "There isn't" and "There aren't" as well as interrogative forms starting with "Is there" or "Are there".