Questions & Answers about Завтра я встану рано, чтобы не опоздать на работу.
Встану is future tense.
It comes from the verb встать = to get up / to stand up.
This verb is perfective, and perfective verbs in Russian form the future with what look like present-tense endings:
- я встану
- ты встанешь
- он/она встанет
So although встану looks like a present form, it means I will get up.
Because встану fits a single completed action tomorrow morning.
Russian often contrasts:
- встать → perfective, one completed act: to get up
- вставать → imperfective, process, repetition, or habit: to be getting up / to get up regularly
So:
- Завтра я встану рано = tomorrow I’ll get up early once
- Я буду вставать рано = I’ll be getting up early / I’ll start getting up early regularly
In this sentence, the speaker means one specific action tomorrow, so встану is the natural choice.