Tämän e-kirjan laina-aika päättyy pian, joten tarkistan eräpäivän sovelluksesta.

Tämän is the genitive form of tämä (this).

In this sentence, tämän e-kirjan laina-aika means the loan period of this e-book. Finnish often uses the genitive to show that one noun belongs to or is connected with another noun.

So:

• tämä = this
• tämän = of this

Here, tämän is connected to e-kirjan, and together they help describe laina-aika.

E-kirjan is also in the genitive singular.

The base form is:

• e-kirja = e-book

But in tämän e-kirjan laina-aika, Finnish builds a noun phrase that literally works like:

• this e-book's loan period
• or the loan period of this e-book

So:

• e-kirja → e-kirjan
• tämä → tämän

Both words help define laina-aika.

It is a Finnish noun phrase built from several parts:

• tämän = of this
• e-kirjan = of the e-book
• laina-aika = loan period / borrowing time

Together, it means:

• the loan period of this e-book

A very literal breakdown would be something like:

• this e-book's loan period

This kind of structure is very common in Finnish. The main noun comes last, and the earlier words describe it.

These two are related, but they are not the same.

• laina-aika = the loan period, the length of time you are allowed to borrow something
• eräpäivä = the due date, the specific date when it must be returned

So in the sentence:

• laina-aika päättyy pian = the borrowing period will end soon
• tarkistan eräpäivän = I check the due date

One is a period of time, and the other is a specific deadline.

Päättyä means to end, to come to an end, or to expire.

Here:

• laina-aika päättyy pian = the loan period ends soon / the loan period will expire soon

This verb is useful when something finishes by itself:

• kurssi päättyy = the course ends
• sopimus päättyy = the contract ends
• laina-aika päättyy = the loan period ends

It is an intransitive verb, so it does not take a direct object here.

Finnish often uses the present tense for the near future when the meaning is clear from context.

So:

• päättyy pian literally = ends soon
• natural English = will end soon

And:

• tarkistan literally = I check
• natural English here = I’ll check / I’m checking

This is very normal in Finnish. You do not always need a special future form, because Finnish does not have a separate future tense like English.

Pian means soon.

So:

• päättyy pian = ends soon

It is an adverb of time. It tells you when something happens.

Examples:

• Tulen pian. = I’ll come soon.
• Elokuva alkaa pian. = The movie starts soon.

Joten means so, therefore, or which is why.

It connects two ideas:

1. The loan period is ending soon
2. So I check the due date in the app

So the sentence structure is:

• Tämän e-kirjan laina-aika päättyy pian, joten tarkistan eräpäivän sovelluksesta.

This means:

• This e-book’s loan period ends soon, so I check the due date in the app.

Joten is a very common way to show consequence or result.

Because eräpäivän is the object of the verb tarkistan (I check).

The base form is:

• eräpäivä = due date

In this sentence, the speaker is checking a specific due date as a complete action, so Finnish uses the total object. In the singular, that often looks like the genitive form:

• eräpäivä → eräpäivän

So:

• tarkistan eräpäivän = I check the due date

This is a very common Finnish pattern with objects.

For a learner, the easiest answer is:

• it is the object form used for a complete, definite action

In practice, singular total objects often look exactly like the genitive form:

• eräpäivä → eräpäivän

Traditional grammar may discuss whether this is genitive-shaped object marking or accusative function, but for learning purposes, the important point is:

• I am checking the due date as a whole → eräpäivän

So it is best to think of it as a total object in singular form, which usually looks like the genitive.

Because sovelluksesta means from the app, while sovelluksessa means in the app.

The base form is:

• sovellus = app / application

Case forms:

• sovelluksessa = in the app
• sovelluksesta = from the app / out of the app

With the verb tarkistaa in this context, Finnish often uses -sta / -stä to show the source from which information is checked:

• tarkistan eräpäivän sovelluksesta = I check the due date from the app

English often says in the app, but Finnish commonly uses from the app here.

It is not impossible, but sovelluksesta is more natural in this sentence.

Why?

Because the idea is not only where you are located, but also where the information comes from. Finnish often uses the elative case (-sta / -stä) for that.

So:

• sovelluksesta = from the app → natural here
• sovelluksessa = in the app → possible in some contexts, but less natural for this exact idea

A similar pattern appears in expressions like:

• luin sen lehdestä = I read it in/from the newspaper
• katsoin tiedot verkkosivulta = I checked the information on/from the website

Finnish usually uses a hyphen when a word begins with a single letter, abbreviation, or similar element.

So:

• e-kirja = e-book

This is standard Finnish spelling. The same kind of pattern appears in words like:

• TV-ohjelma
• EU-maa

So the hyphen here is normal and correct.

Tarkistaa often means to check, to look up, to verify, or to make sure.

In this sentence, tarkistan eräpäivän most naturally means:

• I check the due date
• I look up the due date

It does not sound especially formal here. It is a very natural everyday verb.

Examples:

• Tarkistan ajan. = I’ll check the time.
• Tarkistan osoitteen. = I’ll check the address.
• Tarkistan eräpäivän. = I’ll check the due date.

The word order is natural and neutral.

The sentence is:

• Tämän e-kirjan laina-aika päättyy pian, joten tarkistan eräpäivän sovelluksesta.

Finnish word order is often more flexible than English because cases show the roles of words, but word order still affects emphasis.

This order feels normal because it goes:

1. topic: this e-book’s loan period
2. statement: ends soon
3. consequence: so I check the due date
4. source: from the app

You could move some parts for emphasis, but this version is the most straightforward.

Yes. It sounds natural, especially in written everyday Finnish.

The vocabulary is ordinary and practical:

• e-kirja = e-book
• laina-aika = loan period
• eräpäivä = due date
• sovellus = app

The structure with joten is also common in normal Finnish.

So this is a good example of clear, modern, everyday Finnish.