74.406 Natural Language Processing

• Features

• Passives

• Questions

• Gaps

• Movement

Sample Rule:

(VP) (V SUBCAT -np-vp:inf) (NP) (VP VFORM inf)

Verb SUBCAT Feature

Sample Rule:

(VP) (V SUBCAT -np-pp:loc) (NP) (PP PFORM LOC)

Prep. Phrases PFORM Feature

Sample Rule:

(VP) (V SUBCAT -np-pp:loc) (NP) (PP PFORM LOC)

More Verb SUBCATs

Auxiliaries COMPFORM Feature

VP (AUX COMPFORM ?s) (VP VFORM ?s)

"be" + progressive progressive

VP (AUX[be]) (VP[ing], +pass)

"The box is being moved."

VP[+pass] (AUX[be]) (VP[pastparticiple], main)

"The box has been moved."

VP (AUX[be]) (VP[ing],+pass) "The box is <VP[ing], +pass>."

VP[pastprt,+pass, ] V[_np, pastprt] "... moved."

VP[ing, +pass] (AUX[[be,ing], pastprt]) (VP[pastprt], +pass)

"The box is being <VP[pastprt]>."

VP[pastprt, +pass, +gap] V[_np, pastprt, +gap] "... moved <gap>."

Integrate gap-indicator:

Passive - Example

Movement

Parsing Questions - Example