Breakdown of Это трудный поиск, для которого мне нужно найти новые документы.
это
this / it is
я
I
новый
new
трудный
difficult
документ
document
найти
to find
нужно
it is necessary
для
for
который
which / who / that (relative pronoun)
поиск
search
Questions & Answers about Это трудный поиск, для которого мне нужно найти новые документы.
Why do we use которого here, and why does it end in -ого?
которого is a form of the relative pronoun который (which). It takes its gender and number from the noun it describes earlier in the sentence—in this case, поиск (search), which is masculine singular. It takes the Genitive case ending -ого because it immediately follows the preposition для (for), which always requires the Genitive case.
Why does the sentence use мне нужно instead of just saying я?
The word нужно means necessary or needed, and it works impersonally. Instead of saying I need, Russian expresses this as to me it is necessary. Therefore, я (I) must change to its Dative case form, мне (to me).
Why is найти used here? Could I use искать?
The verb искать is imperfective and means to look for or to search, focusing on the ongoing process. The verb найти is perfective and means to find, focusing on the successful result. Since the English sentence says you need to find the documents, the perfective verb найти is the correct choice here.
What case is новые документы in this sentence?
It is in the Accusative case because it is the direct object of the verb найти (it is the thing being found). Because documents are inanimate (non-living) objects, their plural Accusative form looks exactly the same as their Nominative (dictionary) form.
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