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Перед уроком стоит проверить, работает ли проектор.

Перед уроком стоит проверить, работает ли проектор.
Before the lesson, it’s worth checking whether the projector works.

Breakdown of Перед уроком стоит проверить, работает ли проектор.

перед
before
работать
to work
урок
the lesson
проверить
to check
ли
whether
стоить
to be worth
проектор
the projector
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Questions & Answers about Перед уроком стоит проверить, работает ли проектор.

What does стоит mean here? Does it literally mean stands?

Here стоит does not mean stands in the literal physical sense.

In the pattern стоит + infinitive, it means something like:

  • it is worth ...
  • it is advisable to ...
  • one should ...

So:

  • стоит проверить = it’s worth checking / one should check

This is a very common Russian way to give mild advice or recommendation.

Why is it перед уроком, not перед урок?

Because the preposition перед normally takes the instrumental case when it means before / in front of.

So:

  • урок = nominative
  • уроком = instrumental

That is why we get:

  • перед уроком = before the lesson

This is a case pattern you simply have to learn with the preposition.

Could I also say до урока instead of перед уроком?

Yes, but the nuance is a little different.

  • перед уроком = right before the lesson, immediately beforehand
  • до урока = before the lesson, more generally, at some time prior to it

In this sentence, перед уроком sounds very natural because checking the projector is something you would usually do shortly before class starts.

Why is it проверить and not проверять?

Проверить is perfective, while проверять is imperfective.

Here, проверить is used because the sentence refers to one complete check:

  • стоит проверить = it’s worth checking once and making sure

If you said стоит проверять, it would sound more like:

  • it’s worth checking regularly
  • one should be checking

So the perfective verb fits better here because this is a single practical action before the lesson.

Why is there a comma before работает ли проектор?

Because работает ли проектор is a subordinate clause.

The main clause is:

  • Перед уроком стоит проверить = Before the lesson, it’s worth checking

The subordinate clause is:

  • работает ли проектор = whether the projector is working

Russian normally separates this kind of subordinate clause with a comma.

What does ли mean here?

Ли marks an indirect yes/no question. In English, it is often translated as:

  • whether
  • sometimes if

So:

  • работает ли проектор = whether the projector is working

Compare:

  • direct question: Проектор работает? = Is the projector working?
  • indirect question: проверить, работает ли проектор = check whether the projector is working
Why is it работает ли проектор, not ли работает проектор?

In Russian, ли usually comes after the word that is being questioned or focused.

Here the thing being questioned is работает:

  • работает ли проектор = whether the projector is working

Putting ли at the very beginning would be wrong in standard Russian.

This is a very common pattern:

  • Я не знаю, придёт ли он. = I don’t know whether he’ll come.
  • Надо проверить, открыт ли магазин. = We need to check whether the store is open.
Why is проектор in the nominative case?

Because проектор is the subject of the subordinate clause:

  • работает ли проектор = whether the projector is working

The verb работает agrees with проектор, so проектор stays in the nominative.

Why is работает in the present tense? Shouldn’t it be something like is working?

Russian does not have a separate grammatical form exactly like the English present progressive (is working).

So работает can mean either:

  • works
  • is working

The exact meaning depends on context.

In this sentence, the natural English translation is:

  • whether the projector is working

because we are talking about its current functioning before the lesson.

Is there an omitted subject, like we should check or you should check?

Yes, in a sense. Russian often uses impersonal constructions where English might prefer an explicit subject.

  • Перед уроком стоит проверить... literally has no expressed we or you
  • but in meaning it implies something like it would be good to check...

Depending on context, English could translate it as:

  • Before the lesson, it’s worth checking...
  • Before the lesson, you should check...
  • Before the lesson, we should check...

Russian leaves that unstated because it is not important here.

Can the word order be changed?

Yes. Russian word order is fairly flexible, though different orders can slightly change emphasis.

For example:

  • Перед уроком стоит проверить, работает ли проектор.
  • Стоит перед уроком проверить, работает ли проектор.

Both are possible.

The original version sounds very natural because it starts with the time phrase перед уроком, setting the scene first: Before the lesson...

Can ли be replaced or omitted?

Usually ли is the normal way to form this kind of indirect yes/no question.

So this is standard:

  • проверить, работает ли проектор

You can also rephrase it as:

  • проверить, работает проектор или нет = check whether the projector is working or not

That version is a bit more explicit. But simply omitting ли without changing the structure would usually sound wrong or incomplete.

Is this sentence formal, neutral, or conversational?

It is quite neutral and natural. It would work well in:

  • everyday speech
  • school or university contexts
  • workplace instructions

It sounds a little more polished than a very casual spoken version, but it is not overly formal.

A more direct, conversational alternative might be:

  • Перед уроком надо проверить, работает ли проектор.
  • Перед уроком нужно проверить, работает ли проектор.

These mean it’s necessary / you need to check and sound a bit stronger than стоит проверить.