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This page pertains to UD version 2.

mark: marker

A marker (mark) is the word introducing a clause subordinate to another clause. For a complement clause, this will typically be that or whether. For an adverbial clause, the marker is typically a preposition like before or a subordinating conjunction fulfilling a similar role like while or although. The mark is a dependent of the subordinate clause head.

Forces engaged in fighting after insurgents attacked
mark(attacked, after)
He says that you like to swim
mark(swim, that)

The infinitive marker to is also analyzed as a mark.

I tried to finish it
mark(finish, to)

When a noun or a verb takes a prepositionally marked non-core argument (modifier) and that modifier is a clause, then we also label that prepositon as mark (as it would not seem reasonable to call it case when it is marking a clause). The result will commonly be a doubly marked clause.

We have no useful information on whether users are at risk .
nsubj(have, We)
det(information, no)
amod(information, useful)
obj(have, information)
mark(risk, on)
mark(risk, whether)
nsubj(risk, users)
cop(risk, are)
case(risk, at)
acl(information, risk)
punct(have, .)

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