Yes/no questions have category S[q]. wh-questions have
category S[wq]. Other utterances have neither of these categories,
even when followed by a question mark. For example:
In Italian, yes/no questions have the same word order as declarative
sentences. Nevertheless, the verbs have S[q] categories then. Do
not use the question mark to change the category:
wh-phrases representing an extracted subject (or predicate noun in a
non-existential copula sentence) have category S[wq]/(S[dcl]\NP):
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| 's |
| (S[dcl]\NP)/(S[adj]\NP) |
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wh-phrases representing another extracted argument have category
S[wq]/(S[q]/X) where X is the category of the
extracted argument:
This includes sentences where the extracted phrase represents the non-dummy
“subject” of an existential sentence:
| How |
| ((S[wq]/(S[q]/NP))/N)/(S[adj]\NP) |
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wh-phrases representing an extracted modifier have category S[wq]/S[q]: