This paper discusses the distinction thetic/categorical from the viewp
oint of a modular framework where the main components are, on the one
hand, grammar (a formal component) and information structure (a functi
onal component), both belonging to the language system, and, on the ot
her, an extralinguistic component, conceptual structure. The interacti
on between grammar and information structure results in specific claus
e structures giving rise to a thetic or categorical interpretation, re
spectively. It is maintained that the syntactic structure of thetic an
d categorical clauses is the same, the informational difference betwee
n them being triggered by the interaction between focus-background str
ucture and topic-comment structure. Thetic clauses, thus, are all-focu
sed and all-comment. In addition, their predicate must have a specific
meaning that qualifies the clause for a thetic reading. It is further
maintained that the distinction thetic/categorical is an extra-lingui
stic, conceptual distinction between two ways of perspectivizing an ev
ent. Thetic stands for a perspective where an event is looked upon as
a stage, that is, an event in the flow of other (potential) events; ca
tegorical stands for a perspective where an event is divined into two
parts, one of which is viewed as an entity to which something happens
or which does something. Consequently, there is no such thing as a the
tic clause. There are only clauses that - because of their specific in
formational structure (being all-focused and all-comment) and the ''ri
ght'' meaning of the predicates, sometimes taking help from cotext - u
nambiguously give rise To a thetic reading. The thetic reading is trig
gered by the clause with this specific constellation (primarily its la
cking a topic) looking for its topic in CS, picking out the concept of
a stage as its topic, and commenting on it.