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This page pertains to UD version 2.

aux: auxiliary

An aux (auxiliary) of a clause is a function word associated with a verbal predicate that expresses categories such as tense, mood, aspect, voice or evidentiality. It is often a verb (which may have non-auxiliary uses as well) but many languages have nonverbal TAME markers and these are also treated as instances of aux.

New from v2: Auxiliares used to construct the passive voice are now also labeled aux, although we strongly encourage the use of the subtype aux:pass in language that have a grammaticalized (periphrastic) passive.

Reagan has died
aux(died-3, has-2)
He should leave
aux(leave-3, should-2)
Do you think that he will have left by the time we come ?
aux(think, Do)
aux(left, will)
aux(left, have)

aux in other languages: [bg] [bm] [cop] [cs] [de] [el] [en] [es] [et] [eu] [fi] [fr] [fro] [gsw] [hy] [it] [ja] [kk] [kpv] [myv] [no] [pcm] [pt] [ro] [ru] [sv] [swl] [tr] [u] [urj] [vi] [yue] [zh]