Завтра я сдам сочинение по литературе, если сегодня вечером допишу последний абзац.

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Breakdown of Завтра я сдам сочинение по литературе, если сегодня вечером допишу последний абзац.

• если: if
• сегодня: today
• завтра: tomorrow

Questions & Answers about Завтра я сдам сочинение по литературе, если сегодня вечером допишу последний абзац.

Why is сдам used here, and what exactly does it mean?

Сдам is the 1st person singular future form of сдать.

In this sentence, сдать сочинение means to hand in / submit an essay.

So:

• я сдам = I will hand in
• not I will write

This verb is about turning something in, for example to a teacher.

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Why is сдам a one-word future, not something like буду сдавать?

Because сдать is a perfective verb.

In Russian:

• imperfective verbs usually make the future with буду + infinitive
• perfective verbs make the future with a single form

So:

• сдавать → буду сдавать = will be handing in / will hand in (process, repeated action, or less focus on completion)
• сдать → сдам = will hand in, with emphasis on completion

Here the speaker means a single completed result: tomorrow the essay will be submitted.

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Why is допишу used? What is the difference between пишу, напишу, and допишу?