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Не стоит ехать быстро, если дорога мокрая.

Не стоит ехать быстро, если дорога мокрая.
It’s not worth driving fast if the road is wet.

Breakdown of Не стоит ехать быстро, если дорога мокрая.

не
not
если
if
быстро
fast
ехать
to drive
мокрый
wet
стоить
to be worth
дорога
road
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Questions & Answers about Не стоит ехать быстро, если дорога мокрая.

What does не стоит literally mean, and why is it used here?

Стоит literally means costs / is worth (it). In the impersonal expression не стоит + infinitive, it means it’s not worth (doing) → often naturally translated as you shouldn’t / it’s not a good idea to.

So Не стоит ехать быстро is an idiomatic way to advise against doing something, without directly commanding anyone.

Why is стоит in the 3rd person singular and not agreeing with anyone?

Because не стоит here is an impersonal construction. There is no grammatical subject like he/she/you in the sentence. Russian often uses this pattern:

  • (Не) стоит + infinitive = (not) worth doing / (not) advisable to do

So стоит stays in the default 3rd person singular form.

Why do we use the infinitive ехать after не стоит?

After не стоит, Russian typically uses an infinitive to name the action being evaluated:

  • Не стоит + (что делать?) ехать, говорить, покупать, etc.

Here ехать answers что делать? (what to do).

Why is it ехать and not поехать?

Ехать is the imperfective verb meaning to be driving/to travel (in general, focusing on the process).

Поехать is perfective and often means to set off / to go (as a one-time start of a trip).

In advice like this, Russian usually talks about the manner of driving (the process), so ехать быстро is natural: “to drive fast.”
Using поехать быстро would sound more like “to set off and go fast,” which is less typical here.

What part of speech is быстро, and what exactly does it modify?

Быстро is an adverb. It modifies ехать:

  • ехать (как?) быстро = to drive (how?) fast

So the phrase ехать быстро is a standard “verb + adverb” combination.

Can the word order change? For example, Не стоит быстро ехать…

Yes, both are possible:

  • Не стоит ехать быстро…
  • Не стоит быстро ехать…

They mean essentially the same. The difference is mostly about emphasis and rhythm.
Putting быстро earlier can slightly emphasize fast as the key issue.

Why is there a comma before если?

Because если дорога мокрая is a subordinate conditional clause (“if the road is wet”). In Russian, subordinate clauses are normally separated by a comma:

  • Main clause: Не стоит ехать быстро
  • Conditional clause: если дорога мокрая

So: Не стоит ехать быстро, если дорога мокрая.

Why is it дорога мокрая (nominative), not some other case?

In дорога мокрая, мокрая is a predicate adjective describing the subject дорога:

  • дорога (subject, nominative)
  • мокрая (adjective agreeing with дорога: feminine, singular, nominative)

This is basically an implied “is” sentence: дорога (есть) мокрая = “the road is wet.”

Is мокрая the “short form” or “long form,” and does it matter?

Мокрая is the long form adjective. Short form would be мокра.

Both can work, but they can feel a bit different:

  • дорога мокрая = neutral, common in everyday speech
  • дорога мокра = also correct; can sound a bit more “stative”/matter-of-fact, sometimes slightly more formal or literary depending on context

In this sentence, дорога мокрая is perfectly natural.

Could you replace не стоит with нельзя or не нужно? What’s the difference?

Yes, but the meaning/strength changes:

  • Не стоит ехать быстро… = not worth it / not a good idea (advice, softer)
  • Не нужно ехать быстро… = no need to drive fast (suggestion, often practical)
  • Нельзя ехать быстро… = you must not / it’s forbidden / not allowed (much stronger, can imply rules)

So не стоит is a polite, advisory way to warn someone.