Парень ждёт девушку у метро.

Because ждать normally takes a direct object, and direct objects usually go in the accusative case.

• девушка = nominative singular
• девушку = accusative singular

Since девушка is a feminine noun ending in -а, its accusative singular changes to -у:

• девушка → девушку

So Парень ждёт девушку means The guy is waiting for the girl / young woman.

In Russian, the idea of for after wait is built into the verb itself.

English says:

• wait for someone

Russian says:

• ждать кого? что? = to wait for someone/something

So you do not add a separate word meaning for here. The object simply goes into the appropriate case.

Here у means by, near, next to.

So:

• у метро = by the metro / near the metro station

This is a very common use of у for location near something.

Do not confuse it with another common meaning of у, which can also mean at someone's place or indicate possession in expressions like:

• у меня есть... = I have...

In this sentence, it simply means location: near the metro.

Normally, у requires the genitive case.

So a learner might expect the noun after у to change. But метро is a special kind of noun: it is indeclinable, which means its form does not change across cases.

So:

• nominative: метро
• genitive: метро
• dative: метро
• etc.

That is why у метро looks unchanged even though it is functioning as genitive.

The correct spelling is ждёт, with ё.

• ждать = infinitive
• ждёт = he/she waits, is waiting

In many Russian texts, especially informal or non-learner materials, ё is often written as е, so you may also see ждет. But the pronunciation is still like ждёт, not ждет.

The stress is on the ёт part:

• ждёт

This matters for pronunciation.

Ждёт is:

• 3rd person singular
• present tense
• from ждать

So it means:

• he waits
• he is waiting

Because Russian present tense can cover both a simple and progressive meaning in English, the exact translation depends on context.

Here Парень ждёт девушку can mean either:

• The guy waits for the girl
• The guy is waiting for the girl

In most contexts, English would naturally use is waiting.

No, Russian word order is relatively flexible.

Парень ждёт девушку у метро is a normal, neutral order. But other orders are possible, depending on emphasis:

• У метро парень ждёт девушку. = emphasis on location
• Девушку ждёт парень у метро. = emphasis on who is being waited for
• Парень у метро ждёт девушку. = slightly different information focus

The case endings help show who is doing what, so Russian does not rely on word order as much as English does.

Still, the original order sounds natural and straightforward.

Russian has no articles.

So:

• парень can mean a guy or the guy
• девушку can mean a girl / a young woman or the girl / the young woman

Context tells you which one is meant.

That is very normal in Russian, and learners have to get used to understanding definiteness from the situation rather than from words like a and the.

Not exactly. Парень often means:

• guy
• young man
• boyfriend in some contexts

It depends on the situation.

In this sentence, without extra context, guy or young man is usually the safest interpretation.

So парень is broader than just boy, and using guy is often more natural in English.

No. Девушка can mean:

• girl
• young woman
• sometimes girlfriend, depending on context

In many everyday situations, it often refers to a young woman, not necessarily a child.

So when translating, girl is possible, but young woman may be better in some contexts.

Ждать is imperfective.

That makes sense because waiting is usually presented as:

• an ongoing action
• a process
• a repeated action

So ждёт naturally means is waiting or waits.

Russian often uses the imperfective for actions in progress, and waiting is a classic example of that.