English: A tree diagram for the clause "What did you buy there?" The clause has a fronted noun phrase (Front: NP) "what" and a head clause. That has a fronted verb "can" and a head clause. This clause has a subject noun phrase (Subj: NP) "you" and a head verb phrase (Head: VP). The verb phrase has a head Gap co-indexed to the fronted verb "can" and a complement clause (Comp: Clause). This clause has a head VP and an adjunct prepositional phrase (Adjunct: PP) "there". The VP has a head verb "buy" and an object gap (Obj: gap) co-indexed to the fronted NP.
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