Breakdown of Тебе нужно поверить твоему старшему брату.
брат
brother
твой
your [informal]
тебе
to you (informal)
нужно
it is necessary
старший
older, elder
поверить
to believe (perfective)
Questions & Answers about Тебе нужно поверить твоему старшему брату.
Why does the adjective старшему end in -ему instead of the usual masculine Dative ending -ому?
It is the Dative case of старший (older). It takes -ему because of a Russian spelling rule: after the hushing letters ж, ч, ш, and щ, an unstressed о turns into an е. Since the stress in this word is on the first syllable, the ending becomes -ему instead of -ому.
Why is the whole phrase твоему старшему брату in the Dative case?
The verb поверить (to believe or to trust) requires the person you are believing to be in the Dative case. Because the core noun брату is in the Dative, its modifiers like the possessive pronoun твоему and the adjective старшему must also be in the Dative case to match it.
Why does the sentence start with Тебе instead of Ты?
In Russian, expressions of need often use the impersonal word нужно (it is necessary). This construction requires the person who needs something to be in the Dative case. So, instead of saying 'you need', you literally say 'to you it is necessary', which is why the subject pronoun ты changes to the Dative form тебе.
Is поверить a perfective or imperfective verb, and why is it chosen for this sentence?
Поверить is the perfective form of верить. It is used here because the sentence suggests you need to perform a specific, single action (believing your brother about a particular thing right now), rather than describing a general, continuous state of always believing him.
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