Breakdown of Завтра я обязательно напомню твоей старшей сестре о билете.
сестра
sister
я
I
твой
your [informal]
о
about (о, об, обо)
билет
ticket
завтра
tomorrow
обязательно
definitely
старший
older, elder
напомнить
to remind (perfective)
Questions & Answers about Завтра я обязательно напомню твоей старшей сестре о билете.
Why are твоей and старшей in this specific form?
They are in the dative case to match the noun they describe, сестре (sister). The verb напомнить (to remind) requires the dative case for the person receiving the reminder. Since the basic phrase is твоя старшая сестра, the possessive pronoun and adjective must change to their feminine dative forms: твоей старшей.
Why does the adjective старшей end in -ей instead of the usual feminine dative ending -ой?
This is due to a spelling rule. The stem of старшая ends in the hushing letter ш. After the letters ж, ш, ч, щ, ц, we cannot write an unstressed о. Therefore, the standard -ой ending changes to -ей.
Why does напомню translate to the future tense without using the helper word буду?
Напомнить is a perfective verb, which means it focuses on a completed result. Perfective verbs do not have a present tense. When you conjugate them using the standard present tense endings, they automatically create the simple future tense. You only use буду with imperfective verbs.
What case is used for билете at the end of the sentence?
It is in the prepositional case. When you remind someone about something, Russian uses the preposition о followed by the prepositional case. So, the masculine noun билет takes the standard prepositional ending -е.
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