aux: auxiliary
An auxiliary of a clause is a non-main verb of the clause, e.g., a modal auxiliary, or a form of be, do or have in a periphrastic tense.
(Contrary to the older SD and arguments of Pullum (1982) and following, infinitive to is not analyzed as an auxiliary. Instead, it is analyzed as a mark.)
Reagan has died
aux(died-3, has-2)
He should leave
aux(leave-3, should-2)
Treebank Statistics (UD_English)
This relation is universal.
8093 nodes (3%) are attached to their parents as aux.
8066 instances of aux (100%) are right-to-left (child precedes parent).
Average distance between parent and child is 1.71271469170888.
The following 17 pairs of parts of speech are connected with aux: en-pos/VERB-en-pos/AUX (7258; 90% instances), en-pos/ADJ-en-pos/AUX (410; 5% instances), en-pos/NOUN-en-pos/AUX (252; 3% instances), en-pos/ADV-en-pos/AUX (59; 1% instances), en-pos/PROPN-en-pos/AUX (33; 0% instances), en-pos/ADJ-en-pos/VERB (24; 0% instances), en-pos/VERB-en-pos/VERB (14; 0% instances), en-pos/NUM-en-pos/AUX (11; 0% instances), en-pos/PRON-en-pos/AUX (8; 0% instances), en-pos/ADP-en-pos/AUX (7; 0% instances), en-pos/DET-en-pos/AUX (5; 0% instances), en-pos/VERB-en-pos/ADV (5; 0% instances), en-pos/AUX-en-pos/AUX (3; 0% instances), en-pos/ADV-en-pos/ADV (1; 0% instances), en-pos/PRON-en-pos/VERB (1; 0% instances), en-pos/SYM-en-pos/AUX (1; 0% instances), en-pos/VERB-en-pos/ADP (1; 0% instances).
# visual-style 2 bgColor:blue
# visual-style 2 fgColor:white
# visual-style 3 bgColor:blue
# visual-style 3 fgColor:white
# visual-style 3 2 aux color:blue
1 We we PRON PRP Case=Nom|Number=Plur|Person=1|PronType=Prs 3 nsubj _ SpaceAfter=No
2 've have AUX VBP Mood=Ind|Tense=Pres|VerbForm=Fin 3 aux _ _
3 moved move VERB VBN Tense=Past|VerbForm=Part 0 root _ _
4 on on ADV RB _ 3 advmod _ SpaceAfter=No
5 . . PUNCT . _ 3 punct _ _
# visual-style 5 bgColor:blue
# visual-style 5 fgColor:white
# visual-style 7 bgColor:blue
# visual-style 7 fgColor:white
# visual-style 7 5 aux color:blue
1 the the DET DT Definite=Def|PronType=Art 3 det _ _
2 following follow VERB VBG VerbForm=Ger 3 amod _ _
3 weekend weekend NOUN NN Number=Sing 7 nmod:tmod _ _
4 i i PRON PRP Case=Nom|Number=Sing|Person=1|PronType=Prs 7 nsubj _ _
5 will will AUX MD VerbForm=Fin 7 aux _ _
6 be be VERB VB VerbForm=Inf 7 cop _ _
7 ready ready ADJ JJ Degree=Pos 0 root _ _
8 to to PART TO _ 9 mark _ _
9 rock rock VERB VB VerbForm=Inf 7 xcomp _ SpaceAfter=No
10 . . PUNCT . _ 7 punct _ _
# visual-style 6 bgColor:blue
# visual-style 6 fgColor:white
# visual-style 10 bgColor:blue
# visual-style 10 fgColor:white
# visual-style 10 6 aux color:blue
1 It it PRON PRP Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs 3 expl _ _
2 is be VERB VBZ Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin 3 cop _ _
3 true true ADJ JJ Degree=Pos 0 root _ _
4 that that SCONJ IN _ 10 mark _ _
5 Google Google PROPN NNP Number=Sing 10 nsubj _ _
6 has have AUX VBZ Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin 10 aux _ _
7 been be VERB VBN Tense=Past|VerbForm=Part 10 cop _ _
8 in in ADP IN _ 10 case _ _
9 acquisition acquisition NOUN NN Number=Sing 10 compound _ _
10 mode mode NOUN NN Number=Sing 3 csubj _ SpaceAfter=No
11 . . PUNCT . _ 3 punct _ _
aux in other languages: [bg] [cs] [de] [el] [en] [es] [eu] [fa] [fi] [fr] [ga] [he] [hu] [it] [ja] [ko] [sv] [u]