aux: auxiliary
An aux (auxiliary) of a clause is a function word associated (a verb) with a verbal predicate that expresses categories such as tense, mood, aspect, voice or evidentiality. In German this includes verbs sein and haben when they indicate past tense, verb werden when it indicates future tense or a poosibility, as well as modal verbs.
Ich habe es geschafft . \n I made it .
aux(geschafft, habe)
nsubj(geschafft, Ich)
obj(geschafft, es)
Sie ist gegangen . \n She has gone .
aux(gegangen, ist)
Er wird kommen . \n He will come .
aux(kommen, wird)
Das Kind kann sehr gut singen . \n The child can sing very well .
aux(singen, kann)
Note that modal verbs can also be full verbs, in which case they are not associated with another infinitive verb.
ROOT Ich kann nicht mehr . \n I can't any more .
root(ROOT, kann)
nsubj(kann, ich)
aux in other languages: [bej] [bg] [bm] [cop] [cs] [de] [el] [en] [es] [et] [eu] [fi] [fr] [fro] [gsw] [gub] [hy] [id] [it] [ja] [ka] [kk] [ky] [myv] [no] [pcm] [pt] [qpm] [ro] [ru] [sl] [ssp] [sv] [swl] [tr] [u] [urj] [vi] [xcl] [yue] [zh]