UseCl, UseQCl, ImpVP {"not"} PART advmod head
UseComp {"is","are","am","was","were","been","be"} AUX cop head
PredVP, QuestVP {"has","had","have","do","does"} AUX aux head
ImpVP {"do"} AUX aux head
ComplVS {"that"} SCONJ mark ccomp
ComplVV {"to"} PART mark xcomp