Любой студент может спросить, если что‑нибудь непонятно.

Любой студент in this sentence is best translated as any student:

• It emphasizes freedom of choice: whichever student wants to ask, they are allowed to.
• It implies no restrictions: not some special group, but absolutely any one of them.

You could say каждый студент может спросить, but it sounds a bit more like a general rule about every student as a member of a group, almost like a regulation.

Любой is more natural here because it highlights that anyone who wants to may ask, not that everyone must or does ask.

So:

• любой студент ≈ any student (who wants to)
• каждый студент ≈ every student (as a rule, in general)

Russian aspect here shows what kind of action is meant:

• может спросить (perfective) – is allowed / able to ask (once, as a complete action)

  • Focus on the fact of performing the action (to ask a question).
  • Very natural when we are talking about permission or opportunity to do one concrete thing.

• может спрашивать (imperfective) – can be asking / is allowed to ask (repeatedly, in general)

  • Would suggest an ability or permission for ongoing or repeated asking.
  • In this specific sentence, может спрашивать sounds less idiomatic and slightly off; we’re talking about the right to raise a question when something is unclear, which is one discrete action each time.

So может спросить is the normal choice because each time something is unclear, the student may ask (a question) as a single, complete act.

In Russian, a comma is usually required between the main clause and a subordinate clause introduced by если.

• Любой студент может спросить – main clause
• если что‑нибудь непонятно – subordinate conditional clause

Rule of thumb: when если introduces a separate clause (with its own structure), you put a comma before it.

You would not normally omit this comma in standard written Russian. Writing it without the comma would be considered incorrect in formal contexts.

Russian often omits the verb “to be” (быть) in the present tense. So:

• что‑нибудь непонятно literally is:
  
  • что‑нибудь – something / anything
  • непонятно – unclear / not understood

The implied full structure would be like:

• если (что‑нибудь) непонятно (есть) – if something is unclear

But in modern Russian, present‑tense есть is usually dropped, so you just have что‑нибудь непонятно.

The whole phrase если что‑нибудь непонятно means “if anything is unclear / if something is not understood.”

Непонятно here is a short neuter form of the adjective непонятный used in a predicative (statement) role, similar to an adverbial predicate:

• непонятно – it is unclear / it’s not understood
• It doesn’t agree with что‑нибудь in gender/number; instead, it functions like an impersonal predicate:
  
  • Мне непонятно. – It is unclear to me.

Непонятный is the full adjective form:

• непонятный текст – an unclear text (ordinary attribute to a noun)

So:

• непонятно – used to say that something is unclear (impersonal statement)
• непонятный – used to describe a noun (an unclear X)

Both are possible:

• что‑нибудь – very typical in conditional and similar contexts:

  • если что‑нибудь непонятно ≈ if anything is unclear
  • It feels more indefinite / non‑specific, often used with if, when, ever types of situations.

• что‑то – also correct here:

  • если что‑то непонятно ≈ if something is unclear
  • Slightly more concrete, though in practice the difference is small, and many speakers would treat them as nearly interchangeable here.

In this sentence, что‑нибудь sounds especially natural because of the “if anything…” flavor: any possible thing that might be unclear.

Yes, that word order is perfectly correct:

• Если что‑нибудь непонятно, любой студент может спросить.

The meaning is essentially the same. The difference is only in emphasis and flow:

• Original: Любой студент может спросить, если что‑нибудь непонятно.

  • Starts by emphasizing the right/permission of the student.

• Reordered: Если что‑нибудь непонятно, любой студент может спросить.

  • Starts by emphasizing the condition (something being unclear).

Both are natural; choice depends on what you want to highlight first in the sentence.

In this context, может спросить is understood primarily as permission / allowed to:

• Любой студент может спросить… – Any student may ask…
  
  • The focus is: They are allowed to ask if something is unclear.

Russian может covers both can and may, but here there is no question about physical or mental ability; the sentence is clearly about the rule or permission in the classroom context. So “may ask” is closer to the intended nuance.

Yes, that sentence is correct:

• Любой студент может задать вопрос, если что‑нибудь непонятно.

Nuance:

• спросить – to ask (someone about something), more general and shorter.
• задать вопрос – literally to pose/ask a question, a bit more explicit and sometimes slightly more formal or “textbook‑like”.

In this specific context, both are fine. Спросить is a bit more direct and colloquial; задать вопрос explicitly mentions вопрос and can sound a bit more neutral/formal.

Here, любой студент is the subject of the sentence:

• Кто может спросить? – Любой студент.
  
  • Subject → nominative case.

Любой is an adjective‑like pronoun and agrees with студент in:

• gender: любой (masc.) + студент (masc.)
• number: singular
• case: nominative

If the role changed, the case would change for both:

• Я вижу любого студента. (accusative)
• У любого студента есть право спросить. (genitive)

In the original sentence, since ‘any student’ is the doer of the action может спросить, nominative is required.