No. 951 in Russian
семи
"Семи" is the dative or prepositional plural form of "семь," meaning "seven" in English.
In a sentence
Семь дней в неделю работают магазины.
Shops are open seven days a week.
In this sentence, 'семь' (not 'семи') is used as a numeral meaning 'seven', but there is no direct occurrence of 'семи'.
Этот фильм понравился всем семи зрителям.
All seven viewers enjoyed this movie.
Here, 'семи' is used as a dative plural numeral modifying 'зрителям' (viewers).
Он подошёл к семи деревьям.
He approached the seven trees.
In this sentence, 'семи' is used as a dative plural numeral to indicate to which trees he approached.
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