Many of the utterances we produce often consist of little things (DPs, VPs, APs, etc.) which, at least at the level of Phonological Form (PF), are non-sentential in nature. Here I adhere to the view that these little things do not derive from full sentences, i.e. they have little syntax. Specifically, I argue against the most recent and influential ellipsis analysis of these constructions developed in Merchant (2004) and explore some of the consequences of assuming the existence of non-sentential constituents for the theory of grammar from the perspective of Principles and Parameters. I also propose that non-sentential constituents are pure focus constructions built on the basis of numerations containing only lexical elements with the feature [+Focus], a hypothesis which allows us to explain many of the properties of non-sentential answers.