Breakdown of Он пообещал сестре купить ноутбук.
сестра
sister
он
he / it (for a masculine noun) / it (for a neuter noun)
купить
to buy (perfective)
ноутбук
laptop
пообещать
to promise (perfective)
Questions & Answers about Он пообещал сестре купить ноутбук.
Why is сестре in the Dative case here?
The verb пообещать (to promise) acts like a verb of assistance or giving, directing a benefit to someone. In Russian, the person receiving the promise takes the Dative case without any prepositions. Therefore, сестра changes to сестре.
Why isn't there a word for 'his' before сестре?
In Russian, possessive pronouns are frequently dropped when the context makes it obvious. Since the subject is он (he), it is naturally understood that he is making a promise to his own sister. You could say своей сестре, but leaving the pronoun out is more natural.
Could I use a conjunction like что (that) instead of the infinitive купить?
Because the same person is doing both actions (he promised and he will buy), you simply connect пообещать directly to the infinitive купить. You would only need что if the subject changes, for example: Он пообещал сестре, что я куплю ноутбук (He promised his sister that I would buy a laptop).
What case is ноутбук in, and why didn't its ending change?
Ноутбук is the direct object of the verb купить (to buy), so it is in the Accusative case. However, because it is a masculine, inanimate noun (a non-living object), its Accusative form is identical to its Nominative (dictionary) form.
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