This is part of archived UD v1 documentation. See http://universaldependencies.org/ for the current version.
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auxpass: passive auxiliary

A passive auxiliary of a clause is a non-main verb of the clause which contains the passive information.

Kennedy has been killed
auxpass(killed, been)
Kennedy was killed
auxpass(killed, was)
Kennedy got killed
auxpass(killed, got)

auxpass in other languages: [bg] [cs] [de] [el] [en] [es] [eu] [fa] [fi] [fr] [ga] [he] [hu] [it] [ja] [ko] [sv] [u]