The SI connector is used for questions where there is subject-verb inversion. On nouns SI- is an alternative to S+, and on invertible verbs (is, has, did, must, etc.) SI+ is an alternative to S-. This allows
to 20bp
Wh- questions work in various different ways; only questions involving who will be discussed here. For subject-type questions, where who is substituting for the subject, who simply has an S+ connector. This allows
to 20bp
For object-type questions, where who is substituting for the object, the B connector is used. Transitive verbs have B- connectors as an alternative to their O+ connectors. Who has a B+ connector. This allows
to 20bp
The following incorrect sentences are rejected:
*Did John chase
*
*Who did John chase Mary
*
*John did Mary chase
*
*Chased John Mary
The following incorrect construction is accepted. In our on-line system, post-processing is used to eliminate this.
*Who John chased