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Penn Treebank syntactic sub-category tags used in the NXT version of Switchboard (i.e. values of the attribute subcat for nt elements):
| Values |
Description |
| ADV |
adverbial (other than ADVP or PP) |
| DIR |
direction |
| IMP |
imperative |
| LOC |
locative |
| LOC,PRD |
locative predicate |
| MNR |
manner |
| NOM |
nominal (on relatives and gerunds) |
| NOM,TPC |
topicalised nominal |
| PRD |
predicate (other than VP) |
| PRD,PRP |
purpose or reason predicate |
| PRD,UNF |
unfinished predicate |
| PRP |
purpose or reason |
| PRP,TPC |
topicalised purpose or reason |
| PUT |
locative complement of put |
| SBJ |
surface subject |
| SBJ,UNF |
unfinished surface subject |
| SEZ |
reported speech |
| TMP |
temporal |
| TMP,UNF |
unfinished temporal |
| TPC |
topicalised |
| UNF |
unfinished |
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