 Hi, this unit discusses the formal differences between the types of verbs in PDE, that is, between auxiliary verbs and main verbs, between primary and secondary auxiliary verbs and between catinative and full lexical verbs. In the virtual session, we will first look at the syntactic category verb. Using the so-called NICE, that is the N-I-C-E criteria, we will not only draw distinction between auxiliary verbs and lexical verbs, but we will also define different types of auxiliaries. A special section is dedicated to the formal description of catinative verbs, a category that may be completely new for you. If you need guidance, you can use the question sheet with its hyperlinks for help. The mastery worksheet, another dynamic multiple-choice test, exhibits a number of questions to find out whether you have understood the main aspects of the category verb in PDE. In the practical, you will find data about verbs embedded within sentences, ready to be analyzed, and I'm sure you will profit a lot of it.