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Grammar is normally thought of as a set of rules for putting together lexical items.
This conception of grammar can be captured in Langacker’s theory. Grammar consists of
assemblies of symbolic structures which represent common patterns for joining smaller
symbolic structures (2008:168). For example, English has a very productive schema for
compounds which involves joining two nouns (2008:176). A schema for this pattern would
show not only the final
composite
structure, but also how the individual items (called
component
s) are connected. The connections are called
correspondences
. The
correspondences connecting the components represent how these are integrated. There are
also correspondences linking the components to the composite structure, but in this case the
correspondences represent composition (2008:164). The component elements, the composite
structure and the correspondences together form a
constructional schema
(2008:168).
An important concept detailed by Langacker is schematization. A
schema
is arrived
at by noticing commonalities between multiple usage events (2008:17). When experiencing
language, humans can abstract away from characteristics of specific usage events and notice
patterns that are repeated throughout language. Then these schemas can be used to understand
and to produce new expressions (2008:215).
Schemas can be derived at different levels of abstraction. The ditransitive can be
described with a high level schema (Transfer[verb] + Nominal + Nominal). But it is also
possible to posit lower level schemas that capture common patterns, such as (give + me +
Nominal) (2008:243). These lower-level schemas can in fact be more active in understanding
and producing language, even if there is a higher-level schema. Since they are lexically filled,
lower-level schemas provide better motivation for new expressions (2008:237).
Schemas, though he represents them as boxes in his diagrams, are in fact not discrete
elements; they are immanent in their instantiations (2008:56). Schemas are not distinct from
the specific usage events, but instead lie within them (2008:174). For example, the lower
level schema (give + me + Nominal) is also an example of the (Transfer[verb] + Nominal +
Nominal). The more abstract schema is immanent in the more specified schema. Due to the
restrictions of paper and written form, schemas are always represented as separate even
though this is not really the case.
Verbs can be characterized as schemas. The schema for a verb will include
participants. These participants are accorded different levels of prominence. The focal or
main participant is a
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