Сегодня я сделал новую запись в блокноте.

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Breakdown of Сегодня я сделал новую запись в блокноте.

• в: in
• новый: new
• сегодня: today

Questions & Answers about Сегодня я сделал новую запись в блокноте.

Why is it я сделал, not я делал?

Both are past tense, but they differ in aspect:

• сделал is perfective. It presents the action as a single completed whole: I made (and finished making) a new entry today.
• делал is imperfective. It presents the action as process, repeated action, or background: I was making / used to make a new entry today (sounds incomplete or like part of a longer story).

In this context, you want to say the entry is finished, so the perfective сделал is natural.

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Why is сделал masculine if я doesn’t have gender?

In Russian, past-tense verbs agree in gender with the person or thing doing the action:

• я сделал – I (male speaker) made
• я сделала – I (female speaker) made

The pronoun я itself is not marked for gender, but the verb form reveals the speaker’s gender.
So if the speaker is male, he says я сделал; if the speaker is female, she says я сделала.

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What case is новую запись and why?