Breakdown of Учёный не доверяет новому эксперименту, пока жидкость не начнёт кипеть.
не
not
новый
new
учёный
scientist, scholar
доверять
to trust
начать
to begin (perfective)
эксперимент
experiment
жидкость
liquid
пока не
until
кипеть
to boil
Questions & Answers about Учёный не доверяет новому эксперименту, пока жидкость не начнёт кипеть.
Why is there a не before начнёт? Doesn't that mean 'until the liquid doesn't start'?
In Russian, the conjunction пока не is used together to mean 'until'. Even though it contains the negative particle не, it does not make the action itself negative in translation. You can think of the literal logic as 'as long as the liquid has not yet started to boil'.
The English translation says 'until the liquid starts', so why is начнёт in the future tense?
English often uses the present tense for future events after words like 'until' or 'when'. Russian grammar is more strictly logical about time: because the liquid has not started boiling yet and this will happen later, the future tense начнёт must be used.
Why are we using the dative case for новому эксперименту?
The verb доверять (to trust) always requires the dative case for the person or thing being trusted. That is why the nominative phrase новый эксперимент changes to the dative новому эксперименту.
Why is кипеть imperfective here, while начнёт is perfective?
In Russian, verbs that express starting, continuing, or finishing an action (often called 'phase verbs') must always be followed by an imperfective infinitive. While the starting is a one-time future event (начнёт), the boiling itself (кипеть) is the ongoing process that gets started.
The word учёный has an adjective ending. Is it an adjective or a noun here?
Учёный acts as a noun here meaning 'scientist', but it originally developed from an adjective meaning 'learned'. Words like this function as nouns in a sentence but still use standard adjective endings when they change case.
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