Я перепишу номер в блокнот, чтобы не перепутать его снова.

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Breakdown of Я перепишу номер в блокнот, чтобы не перепутать его снова.

• в: in
• не: not
• снова: again

Questions & Answers about Я перепишу номер в блокнот, чтобы не перепутать его снова.

Why is перепишу used here, and what tense is it?

Перепишу is the 1st person singular form of the perfective verb переписать. In Russian, perfective verbs have a “simple future”, so перепишу means I will copy/rewrite (once, to completion).

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What’s the difference between переписать and записать in this context?

Both can work, but the nuance differs:

• переписать = to copy/rewrite from another source (e.g., copying a number from a screen/business card into a notebook).
• записать = to write down / record (not necessarily copying; could be writing from memory or taking notes). So перепишу номер strongly suggests you’re transferring the number from somewhere else.

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Why is номер in the accusative, and how do I know?

Because it’s the direct object of the verb (перепишу = “I will rewrite/copy what?”). For masculine inanimate nouns like номер, accusative often looks the same as nominative: номер.

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Why is it в блокнот and not в блокноте?