The document discusses the use of the phrases "there is" and "there are" in English. It states that these phrases indicate that something exists or is in a certain location, with the main subject following the verb. Examples are given using "there is" with singular nouns like "an apple" and "a fly". Further examples use "there are" with plural nouns like "some apples" and "plenty of oranges". The summary concludes that other forms of "to be" verbs can also be used with "there is/there are", giving the examples "There will be a party", "There were witnesses", and "There have been robberies".