Breakdown of Нельзя перегревать этот прибор, иначе он сломается.
он
he / it (for a masculine noun) / it (for a neuter noun)
этот
this [f: эта, n: это]
нельзя
one must not
прибор
device
сломаться
to break down (pf) / to break
иначе
otherwise, differently
перегреть
to overheat
Questions & Answers about Нельзя перегревать этот прибор, иначе он сломается.
How does the prefix пере- work in the verb перегревать?
The root verb here is греть (to heat or to warm). By adding the prefix пере-, we add the meaning of "too much" or "to excess." Therefore, перегревать means "to overheat." This is a classic example of пере- indicating an excessive action.
Why is the imperfective verb перегревать used after нельзя instead of the perfective перегреть?
When нельзя is followed by an imperfective verb, it expresses a strict prohibition: "one must not." If you used the perfective verb here (нельзя перегреть), it would completely change the meaning to "it is impossible to overheat" (for example, if the device had a flawless cooling system). Since the sentence is a warning not to do something, the imperfective aspect is mandatory.
Why does сломается need the reflexive -ся ending here?
The non-reflexive сломает means "will break [something else]" (a transitive action). Because the device isn't breaking another object, but rather undergoing the breaking process itself, Russian requires the reflexive form сломаться (perfective) to make the action intransitive.
Could I use а то instead of иначе in this sentence?
Yes, absolutely. Both mean "otherwise" in this context. Иначе is slightly more formal and neutral, which fits a standard warning about a device, while а то is very common in everyday conversational speech and would work perfectly here: ...а то он сломается.
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