Breakdown of Он верит в добро.
он
he / it (for a masculine noun) / it (for a neuter noun)
верить
to believe
добро
the good, the kindness (n)
Questions & Answers about Он верит в добро.
Why is добро in the accusative case here instead of the prepositional case after в?
While в usually takes the prepositional case to show location, the verb верить (to believe) specifically requires в plus the accusative case when you want to say you believe in something or someone.
Could I just say Он верит добру without the preposition в?
That would change the meaning. Верить followed directly by the dative case means "to trust" or "to believe what someone says" (for example, Он верит мне means "He believes me"). Верить в plus the accusative means "to believe in the existence or power of" something, which fits this sentence perfectly.
Is добро related to the adjective добрый?
Yes! Добро is a neuter noun that means "good", "goodness", or "kindness". It is the root of the adjective добрый (kind/good) which you likely already know from common greetings like доброе утро (good morning).
If добро is in the accusative case, why didn't its ending change?
Добро is a neuter inanimate noun. For all neuter inanimate nouns, the accusative case form looks exactly the same as the nominative (dictionary) form. You generally only change the ending to -у or -ю for feminine nouns.
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