Learn Hardcore Russian: Я могу петь песню.

In Russian, modal verbs like мочь are always followed by an infinitive. This is similar to English where we say “I can sing,” with “sing” remaining in its base form. The infinitive петь directly indicates the action that the speaker is able to perform.

What does the modal verb могу mean and how is it conjugated?

The word могу is the first-person singular form of the irregular verb мочь, meaning “can” or “to be able to.” It expresses the speaker’s ability to perform the action. Since мочь is irregular, its forms must be memorized, and могу is standard for “I can.”

Why is the noun written as песню instead of песня?

The noun песня (“song”) appears as песню because it is in the accusative case, which is used for direct objects in Russian. Feminine nouns of the first declension typically change their ending in the accusative singular—from -я to -ю—even though their nominative form is песня.

What aspect is the verb петь in, and why is that important in this context?

The verb петь is in the imperfective aspect. This aspect is used to express a general, habitual action or ability rather than a completed action. Using the imperfective form is appropriate here because the sentence describes a general ability (“I can sing a song”) rather than referring to a single, completed singing event.