This document provides examples to practice distinguishing between the indefinite expressions of quantity "some" and "any" as well as the indefinite article "a/an" in English. It includes 20 sentences where the learner must choose the correct expression - "some", "any", "a" or "an" - to complete each sentence. It then continues with additional exercises practicing the use of quantity expressions like "a lot of", "much", "many", "lots of" and others.