Breakdown of Wiadomo, że on zaginął wczoraj wieczorem.
on
he / it (m)
wieczorem
in the evening
że
that
wczoraj
yesterday
wiadomo
known / it is known (impersonal)
zaginąć
to go missing / to disappear (become lost)
Questions & Answers about Wiadomo, że on zaginął wczoraj wieczorem.
How does wiadomo function in this sentence?
Wiadomo is an impersonal predicate. This means it acts as the main verb of the sentence but doesn't take a subject (there is no 'it' or 'to' before it). Here, it pairs with the conjunction że (that) to introduce an established fact: 'It is known that...'
Could we use a question word like kiedy instead of że after wiadomo?
Yes, but the structure's purpose shifts slightly. With że, you state the entire following clause is a known fact. If you use a question word, you state that a specific detail is known, for example: Wiadomo, kiedy on zaginął (It is known when he went missing).
Why do we include the pronoun on here if Polish usually drops subjects?
While Polish is a pro-drop language, subject pronouns are often kept after conjunctions like że to clearly establish the subject of the new subordinate clause, especially if we are introducing a new topic or contrasting him with someone else.
What is the infinitive of zaginął and what should I watch out for in its past tense?
The infinitive is the perfective verb zaginąć (to go missing). Because it is a -nąć verb, you need to watch out for the vowel shifts in the past tense stem: it is zaginął for a masculine subject, but switches to an 'ę' for feminine (zaginęła) and virile/masculine personal (zaginęli).
Why is wieczorem in the instrumental case rather than the nominative wieczór?
Polish frequently uses the instrumental case for times of day to answer the question 'when?'. Just as noc becomes nocą (at night), wieczór becomes wieczorem (in the evening). Together with wczoraj, it forms the standard phrase for 'yesterday evening'.
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