In Finnish, negation is marked using the verb ei, which is used as an auxiliary and assigned the dependency relation neg. The most commonly negated elements are verbs and verb phrases, but occasional exceptions in verbless constructions are allowed.
If a conjunction or adverb has been merged together with ei, as in for instance ettei (että+ei “that+not”) or miksei (miksi+ei “why+not”), then the word is marked as a conjunction or an adverb rather than a negation verb. However, eikä “and+not”, when it appears alone and not coordinating another clause or phrase, is still marked as neg.
FinnTreeBank (FI_FTB) is tokenized differently:
it treats ettei the same as että ei (“that not”),
miksei as miksi ei (“why not”) and so on,
as if they were two separate words.
Consequently, ei (“not”) represents a normal negation verb
in these combinations and gets annotated neg.
On the other hand, eikä (“and+not”) is treated as a single
token with a clitic particle (and also marked as neg).
Treebank Statistics (UD_Finnish)
This relation is universal.
1755 nodes (1%) are attached to their parents as neg.
1749 instances of neg (100%) are right-to-left (child precedes parent).
Average distance between parent and child is 1.96923076923077.
The following 8 pairs of parts of speech are connected with neg: VERB-VERB (1478; 84% instances), ADJ-VERB (120; 7% instances), NOUN-VERB (111; 6% instances), ADV-VERB (32; 2% instances), AUX-VERB (5; 0% instances), PRON-VERB (4; 0% instances), PROPN-VERB (4; 0% instances), NUM-VERB (1; 0% instances).