The meaning of the preposition в/во depends on the case of its object. If the object is Accusative, the preposition means 'to, into'; if the object is Prepositional, the preposition means 'at, in'.
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в plus Accusative means motion to, into.
в plus Prepositional means location at, in.
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Motion (Acc.):
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Ћн ходќл в Большћй теђтр.
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He went to the Bolshoi Theater.
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Location (Prep.):
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Ћн бІл в Большћм теђтре.
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He was at the Bolshoi Theater.
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Motion (Acc.):
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Ћн ходќл в университљтскую библиотљку.
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He went to the university library.
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Location (Prep.):
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Ћн бІл в университљтской библиотљке.
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He was at the university library.
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Motion (Acc.):
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Ћн ходќл в пђрк.
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He went to the park.
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Location (Prep.):
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Ћн бІл в пђрке.
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He was in the park.
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The variant во is used before consonant clusters beginning with в-, ф-, and мн- as well as before certain vowel-less stems, e.g. во что, во сне. Similar variations occur with several other prepositions, e.g. as к/ко and с/со. The entry in 5000 Russian Words or The Russian Dictionary Tree will tell you which consonant clusters affect each preposition.
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