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Kirjaudu sisään nyt tarkistaaksesi eräpäivän ja uusiaksesi lainan yhdellä kertaa.

Kirjaudu sisään nyt tarkistaaksesi eräpäivän ja uusiaksesi lainan yhdellä kertaa.
Log in now to check the due date and to renew the loan in one go.

Breakdown of Kirjaudu sisään nyt tarkistaaksesi eräpäivän ja uusiaksesi lainan yhdellä kertaa.

nyt
now
ja
and
tarkistaa
to check
kirjautua sisään
to log in
eräpäivä
due date
uusia
to renew
laina
loan
-akseen
in order to
yhdellä kertaa
in one go
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Questions & Answers about Kirjaudu sisään nyt tarkistaaksesi eräpäivän ja uusiaksesi lainan yhdellä kertaa.

What form is kirjaudu—is it a command?

Yes. Kirjaudu is the 2nd person singular imperative of kirjautua (to log in). It’s telling one person (informal sinä-address) to log in: Log in …

Why does it say sisään after kirjaudu? What does sisään add?

Sisään literally means (to the) inside / in (motion “into”). In practice, kirjautua sisään is a very common fixed expression for to log in / sign in.
You can sometimes see just Kirjaudu in UI text, but kirjaudu sisään is especially common and clear.

How do you make it polite or address multiple people?

Finnish changes the imperative:

  • To one person (informal): Kirjaudu sisään
  • To one person (polite te / or to several people): Kirjautukaa sisään UI text often uses the singular Kirjaudu… even when addressing users generally, but Kirjautukaa… is the explicit plural/polite form.
What is the grammar of tarkistaaksesi? Why not just a normal verb form?

Tarkistaaksesi is a purpose structure meaning in order for you to check.
It’s built from the verb tarkistaa (to check) using the “-kse-” purpose construction plus a possessive ending:

  • tarkistaa → tarkistaa-kse-
    • -si (your/you) → tarkistaaksesi

A very common alternative is:

  • Kirjaudu sisään nyt, jotta voit tarkistaa eräpäivän… = Log in now so that you can check the due date…
Why does tarkistaaksesi end in -si?

The -si is a possessive suffix that marks the understood subject of the purpose clause as you.
So tarkistaaksesi explicitly means for you to check (matching the command to “you”).

Other persons look different, e.g.:

  • tarkistaakseen = for him/her/them to check
  • tarkistaaksemme = for us to check
Why are there two similar words: tarkistaaksesi … ja uusiaksesi …?

Because there are two separate purposes, both tied to the “log in now” instruction:

  • to check the due date
  • and to renew the loan

Finnish often repeats this purpose form with ja when the two actions are parallel. It’s the cleanest way to show that both are “in order to …”.

What case are eräpäivän and lainan, and why?

Both eräpäivän and lainan are in the genitive, which is also the form used for a total (complete/definite) object in many sentences.

  • tarkistaa eräpäivän = check the due date (a specific, complete item)
  • uusia lainan = renew the loan (a specific loan)

If you wanted to emphasize an indefinite/partial idea, Finnish might use the partitive in other contexts, but here it’s clearly a specific due date and a specific loan, so the genitive/total object is natural.

What does uusia mean here—doesn’t it mean “new”?

uusi = new (adjective)
uusia = to renew (verb)

In library/service Finnish, uusia laina means to renew a loan (extend the loan period). So uusiaksesi lainan = in order to renew the loan.

What does yhdellä kertaa mean, and why is it in that form?

yhdellä kertaa means in one go / at once / in a single session.

Grammar-wise, it’s:

  • yksi (one) → yhdellä (adessive: “on/with/by one”, used in many “by means/at” expressions)
  • kerta (time/occasion) → kerralla/ kertaa depending on expression; here the fixed phrase is yhdellä kertaa.

A very common near-synonym is kerralla = at once / in one go (more general, less explicitly “one”).

Is the word order important? Could nyt move?

Word order is somewhat flexible, but this is a very natural UI-style order:

  • Kirjaudu sisään nyt … = Log in now …

You could also say:

  • Kirjaudu nyt sisään … Both are understandable; sisään nyt feels slightly more “set phrase + time word”, which is common in instructions.