This article provides an overview of the main facts and analytical problems that relate to verbal periphrases. The article is structured as follows. In §1 I provide an overview of the main criteria for being a periphrasis, and the constructions that it should be differentiated from. §2 is devoted to the nature of the auxiliary verb, and its limits with other types of verbs. In §3 I talk about the auxiliated verb, and the linking element that sometimes appears in connection to it. §4 briefly discusses the main structure of a periphrasis, and is followed by a few sections about the syntactic behaviour of these linguistic objects. §5 discusses the behaviour of clitics within periphrases; §6 talks about the selectional restrictions; §7 talks ab...