Welsh differs from English in a number of ways. The most obvious point is that it is a VSO language, but it also has distinctive agreement phenomena and clitics. For this reason, it is natural to ask of any theory of syntax that has been developed primarily on the basis of English: how can it handle Welsh? Welsh has had fairly extensive attention within the Government-Binding theory (see, for example, Harlow, 1981; Sproat, 1985; Sadler, 1988, and Hendrick, 1988). It has also had some attention within Generalized Phrase Structure Grammar (GPSG) (see Harlow, 1983; Borsley, 1983; 1988a). In this paper, I will consider how some of the central features of Welsh can be accommodated within Head-driven Phrase Structure Grammar (HPSG). This is a framework developed over the last few years by Carl Pollard, Ivan Sag and others, which seeks to combine the insights of GPSG, categorial grammar and certain other theories (see Pollard, 1985, 1988; Sag & Pollard, 1987, and Pollard & Sag, 1988). In fact, I will be mainly concerned with the version of HPSG developed in Borsley (1986, 1987, 1988 b), but I will also have something to say about standard HPSG.
