This paper analyses the use of English that in a range of socially dis
tinct discourses. The uses that are conventionally considered to be no
nstandard or colloquial express interpersonal, affective meanings by c
o-ordinating the speaker's and the addressee's attention on those poin
ts in the discourse where a shared perspective is assumed to exist. Ot
her uses of that in the corpus analysed here, including the relativize
r and the complementizer, also have a primarily interactive function i
n discourse. When seen within this perspective, several problems that
previous scholars have noted in the analysis of deictic that no longer
appear problematic, but instead follow a regular pattern of use. This
pattern reflects the ways in which speakers and addressees co-operate
in order to manage the cognitive and social constraints on their join
t creation of discourse.