Сегодня у меня нет проездного, поэтому я куплю разовый билет на метро.

Breakdown of Сегодня у меня нет проездного, поэтому я куплю разовый билет на метро.

я
I
купить
to buy
на
for
сегодня
today
билет
the ticket
метро
the metro
нет
no
проездной
the travel pass
поэтому
so/therefore
разовый
single (one-time)
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Questions & Answers about Сегодня у меня нет проездного, поэтому я куплю разовый билет на метро.

Why does Russian say у меня for I have (as in у меня нет…) instead of a verb meaning to have?

Russian commonly expresses possession with the structure у + Genitive (literally at/by someone):

  • у меня = at me / with me → idiomatically I have
    So у меня нет проездного literally means By me there is no travel pass, i.e. I don’t have a pass.
    Russian does have иметь (to have), but it’s used less in everyday speech and often sounds formal or bookish in simple “I have / don’t have” statements.
Why is it нет проездного—why does проездной change form?

After нет (from не + есть, “there is not”), the noun usually goes in the genitive case.

  • nominative: проездной (билет) (informally just проездной)
  • genitive: проездного
    So: нет чего?нет проездного.
What exactly is проездной—is it a ticket, a pass, or a card?
Проездной is a common everyday word for a travel pass (a pass valid for multiple rides or for a time period). It’s often short for проездной билет. In many cities it can be a physical card, but the word refers to the type of fare product (a pass), not necessarily the material form.
Why is it Сегодня у меня нет…—could the word order be different?

Yes, Russian word order is flexible. Сегодня is placed first to set the time/topic: As for today…
Other natural options include:

  • У меня сегодня нет проездного… (more emphasis on “I don’t have it today”)
  • Сегодня проездного у меня нет… (more contrast/emphasis)
    All mean basically the same; the chosen order feels neutral and fluent.
What does поэтому mean here, and how is it different from потому что?
  • поэтому = therefore / so / that’s why (introduces the result)
  • потому что = because (introduces the reason)

In the sentence:
…нет проездного, поэтому… = …I don’t have a pass, so… (reason → result)

If you used потому что, you’d usually flip the logic:
Я куплю разовый билет, потому что у меня нет проездного.
= I’ll buy a single ticket because I don’t have a pass.

Why is there a comma before поэтому?

Because it separates two clauses in a compound sentence:
1) Сегодня у меня нет проездного
2) поэтому я куплю разовый билет на метро
Russian punctuation typically uses a comma between these clauses, especially with linking words like поэтому.

Why is it я куплю (perfective) and not я покупаю (imperfective)?

куплю is the perfective future of покупать/купить and focuses on a single completed action: I will buy (once, to get it done).
я покупаю is present/imperfective and would mean I am buying (right now) or I buy (habitually)—not the intended meaning here.
For a planned one-time purchase, куплю is the default.

Do you have to include я in поэтому я куплю…?

Not always. Russian often drops subject pronouns because the verb ending already shows the person:

  • …поэтому куплю разовый билет… is completely natural.
    Including я can add a bit of emphasis/contrast (e.g., “so I will buy…”).
What does разовый билет mean, and why разовый instead of something like “one-time”?

разовый means single-use / one-time / for one occasion.
So разовый билет = a single ticket / one-ride ticket (context-dependent; in metro context it’s usually a single trip).
Russian uses разовый as the standard adjective for something intended for one use: разовая поездка, разовый пропуск, etc.

Why is it билет на метро—why на and not в?

With transport, Russian commonly uses:

  • билет на + Accusative = a ticket for (travel by) …
    So билет на метро = a ticket for the metro (i.e., to ride the metro).

в метро usually means in the metro (location), not “for the metro”:

  • Я в метро. = I’m in the метро.
  • Я купил билет в метро. = I bought a ticket in the метро (at the station).
Why is it на метро and not на метрополитен? Are they interchangeable?

метро is the common everyday word and is indeclinable (it doesn’t change form).
метрополитен is more formal/official and declines:

  • билет на метрополитен is grammatically possible but sounds bureaucratic.
    In normal speech you’d almost always say метро.
Is проездной masculine—what gender is it, and what would the full phrase look like?

Yes, проездной behaves like a masculine adjective used as a noun (short for a masculine noun like билет).
Fuller versions you might see:

  • проездной билет (masculine)
  • sometimes regionally проездной (абонемент), but проездной билет is the most straightforward expansion.