Она никогда не перестаёт учиться.

Questions & Answers about Она никогда не перестаёт учиться.

Why is учиться in the imperfective aspect here?
Verbs that express the start, continuation, or end of an action (like stopping) always take an imperfective infinitive in Russian. Because перестаёт means "stops", the following verb учиться must be imperfective, as it represents the ongoing process being stopped.
Why use the imperfective перестаёт instead of the perfective перестанет?
The word никогда (never) shows this is a general, ongoing truth about her character, not a single completed event. Therefore, the main verb itself also needs to be in the imperfective aspect.
Why are both никогда and не used in this sentence?
Russian uses mandatory double negatives. Whenever you use a negative word like никогда (never), you must also put не (not) before the verb. Literally, it translates to "She never does not stop."
Could I use учить instead of учиться here?
No. Учиться is used for the general process of learning, studying, or being a student. If you used учить, you would need to add a direct object to say exactly what she is studying, like учить русский язык (to learn the Russian language).

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