Учитель объясняет грамматику серьёзно.

Breakdown of Учитель объясняет грамматику серьёзно.

учитель
the teacher
грамматика
the grammar
объяснять
to explain
серьёзно
seriously
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Questions & Answers about Учитель объясняет грамматику серьёзно.

Why is учитель in the nominative case?
Because учитель is the subject of the sentence (“the teacher”), and in Russian, the subject of a verb in an independent clause typically appears in the nominative case.
Why is грамматику in the accusative case?
Грамматику is the direct object of the transitive verb объясняет (“explains”). Russian marks direct objects with the accusative case, and feminine nouns like грамматика take the ending in the singular accusative.
What does the ending -ет in объясняет tell me about the verb?
The ending -ет indicates third person singular in the present tense for an imperfective verb of the second conjugation. So объясняет means “he/she explains” or “it explains,” referring here to “the teacher.”
Why is серьёзно ending in , and what part of speech is it?
Серьёзно is an adverb formed from the adjective серьёзный (“serious”). Russian adverbs that modify verbs often end in or , and they answer “how?” In this sentence, серьёзно tells us how the teacher explains grammar.
Can I change the word order to Учитель серьёзно объясняет грамматику? Does the meaning change?
Yes, you can say Учитель серьёзно объясняет грамматику without changing the core meaning. Word order in Russian is relatively flexible and often used to emphasize different parts; both sentences mean “The teacher explains grammar seriously,” though placing серьёзно earlier may slightly emphasize the manner of explanation.
Why isn’t there any article like “the” or “a” before учитель or грамматику?
Russian does not have articles like “the” or “a.” Definiteness or indefiniteness must be inferred from context, word order, or added words (e.g., этот учитель for “this teacher”).
Is учитель always masculine? How would I say “female teacher”?
By default учитель is masculine. To specify a female teacher, use учительница. For example, Учительница объясняет грамматику серьёзно.
What is the difference between объясняет and объяснил?
Объясняет is present tense, imperfective aspect, meaning the action is ongoing or repeated (“he is explaining” or “he explains”). Объяснил is past tense, perfective aspect, meaning the action is completed (“he explained”).