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Except for the node label on the extracted position, the trees for wh-questions
on S complements look exactly like the trees for wh-questions on NP's in the
same positions. This is because there is no separate wh-lexical item for
clauses in English, so the item what is ambiguous between representing a
clause or an NP. To illustrate this ambiguity notice that the question in
((153)) could be answered by either a clause as in ((154)) or an NP as in
((155)). The extracted NP in these trees is constrained to be <wh>=+, since sentential complements can not be topicalized.
- What does Clove want?
- for Beth Ann to play frisbee with her
- a biscuit