Dative indirect object

The Dative case answers the questions Кому? (To whom?) and Чему? (To what?) and is most commonly used to indicate the indirect object—the person or thing to whom or for whom an action is performed.

1. Indirect Objects (Recipients):
Used with verbs of giving, communication, and helping:

• Giving & Sending: давать (to give), дарить (to gift), посылать (to send). Note: With verbs like покупать (to buy), you can use the Dative to indicate the recipient (купить другу - to buy for a friend) or use для + Genitive (купить для друга).
• Communication & Promising: звонить (to call), писать (to write), говорить (to tell), отвечать (to answer), объяснять (to explain), показывать (to show), обещать (to promise), верить / поверить (to believe). Note: отвечать takes the Dative for a person (отвечать преподавателю) and на + Accusative for answering things like questions or letters (отвечать на вопрос). However, it can also take the Dative for inanimate objects when it means "to meet requirements or standards" (отвечать требованиям). верить takes the Dative for a person to mean trusting their words (верить другу), but в + Accusative to mean believing in someone's potential or in something (верить в тебя, верить в Бога).
• Benefit/Harm & Permission: помогать (to help), мешать (to hinder / to bother), советовать (to advise), разрешать (to allow).
• Teaching & Learning: учить / научить (to teach) takes the Accusative for the person taught and the Dative for the subject matter (учить студентов русскому языку). Note: When учить means "to study/memorize," it takes the Accusative direct object (учить новые слова, учить русский язык). учиться (to study/learn) takes the Dative for the discipline (учиться математике).
• Emotions: Reflexive verbs expressing emotion often take the Dative: радоваться (to be glad/rejoice at), удивляться (to be surprised at). Example: радоваться подарку (to be glad about a gift).
• Verbs without 'to/for' equivalents in English: Some verbs take the Dative even though their English translations take a direct object. The most important example is нравиться (to like / to be pleasing to). Other examples include завидовать (to envy), мстить (to take revenge), сочувствовать (to sympathize with), угрожать (to threaten), and изменять (to cheat on). Examples: Мне нравится эта книга (I like this book); завидовать другу (to envy a friend).

2. Personal Pronouns:
Indirect objects are frequently pronouns: мне (to me), тебе (to you), ему (to him/it), ей (to her), нам (to us), вам (to you pl./formal), им (to them).

3. Noun Endings (Singular):

• Masculine/Neuter: Ends in -у (hard) or -ю (soft). Examples: друг → другу, окно → окну. Soft stems include masculine nouns ending in -й or -ь (e.g., музей → музею, учитель → учителю) and neuter nouns ending in -е or -ие (e.g., море → морю, здание → зданию). (Note: Masculine nouns ending in -а/-я, like папа or мужчина, take -е just like feminine nouns).
• Feminine: Usually ends in -е. Example: мама → маме. (Nouns in -ия change to -ии; nouns in -ь change to -и).
• Irregular: Highly common irregular nouns include мать → матери, дочь → дочери, время → времени, and имя → имени.

4. Plural Endings:
All genders use -ам (hard) or -ям (soft). Example: студенты → студентам. Nouns with irregular soft sign plurals take -ьям (e.g., брат → братьям, дерево → деревьям). Note these highly common irregular plural stems: ребёнок → детям, человек → людям, друг → друзьям.

Note: The Dative is also used with certain prepositions (like к and по) and for logical subjects (e.g., age, feelings, and impersonal constructions like мне нужно or мне холодно), which are covered in separate patterns. Adjective and possessive endings in the Dative case are also covered separately.