No. 1,049 in Russian
начнут
"Начнут" means "they will begin" or "they will start."
In a sentence
Завтра они начнут строить новый дом.
Tomorrow, they will start building a new house.
The word 'начнут' is the future tense third-person plural form of the verb 'начать', meaning 'to start'. Here, it indicates the action of beginning (construction) that will happen tomorrow.
Как только мы начнем проект, они начнут помогать.
As soon as we start the project, they will start helping.
The word 'начнут' in this sentence conveys the idea of beginning (to help) influenced by a condition (our starting the project). It demonstrates dependency in action timing expressed through future tense.
Дети начнут играть, как только закончится урок.
The children will start playing as soon as the lesson is over.
Here, 'начнут' expresses the future action of starting (playing) by the children following the completion of another event (the lesson).
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