Constituent Structure in HPSG: Basic Principles
The constituent structures assumed in HPSG are very close to those sketched on the Traditional Grammar pages.
Some key features of constituent structures in HPSG are:
- The leaves are words, which contain both the phonological and the syntactic information.
- Non-branching structures are avoided.
- Auxiliaries are verbs, with a feature specification [AUX plus]. Non-auxiliary verbs are specified as [AUX minus].
The auxiliary verbs include:
- the infinitival marker to,
- be in all its uses,
- have, at least in its uses as temporal auxiliary.
- The highest verb in a clause is the head of the clause.
- To see how these structures are licensed by the grammar, look at the page about HPSG grammar rules.