What are some of the current issues in parts of speech research? I discuss some of the problems that linguists run into when studying parts of speech / word classes, as well as some of the modern approaches that have been adopted to solve those problems. This is a talk I was invited to give for a class called "Language Patterns" by Prof. Jack Martin at the College of William & Mary in Virginia. The class is about the cross-linguistic patterns we see in language, a subfield of linguistics known as language typology—and my area of specialty! Parts of speech are also called grammatical categories or lexical categories. #linguistics #language #grammar #PartsOfSpeech #typology