This document discusses the differences between the words "like" and "as". It notes that students commonly make mistakes using "like" instead of "as" when something is the same. For example, saying "It's the same like mine" instead of "It's the same as mine". It also explains that "like" is usually followed by a noun or pronoun when comparing something, while "as" is used to talk about function, such as a job title or how something is used. The document provides examples of common collocations using "like" and when to use "as" in comparisons.