Jos en lue sopimusta tarkasti, yksi ehto voi jäädä huomaamatta.

Finnish does not usually use a separate future tense. The present tense is used for present and future situations, and the time is understood from context.

So:

• Jos en lue sopimusta tarkasti... = If I don’t read the contract carefully...

Even though it refers to a possible future situation, Finnish still uses the present tense lue.

Finnish negation uses a special negative verb, which changes according to the person.

Here:

• en = the negative verb for I
• lue = the main verb in its special negative form

So:

• luen = I read / I am reading
• en lue = I do not read / I am not reading

A full version could be:

• Jos minä en lue sopimusta tarkasti...

But minä is often omitted because the person is already clear from en.

This is a very common question. The object is in the partitive because the clause is negative:

• en lue sopimusta

In Finnish, objects in negative clauses normally appear in the partitive.

Compare:

• Luen sopimuksen. = I read the contract.
  
  • This suggests a whole, completed action.
• En lue sopimusta. = I do not read the contract.
  
  • Negative clause, so partitive.

So sopimusta is not random: it is required by the negation.

Because tarkasti is an adverb, while tarkka is an adjective.

• tarkka = careful, precise
• tarkasti = carefully, precisely

Here it modifies the verb lue:

• lue tarkasti = read carefully

So:

• tarkka sopimus would mean something like a precise/careful contract — which does not fit here.
• lukea tarkasti = to read carefully

In everyday Finnish, ehto often means condition or term.

In the context of a contract, it usually means:

• term
• condition
• sometimes clause, depending on the translation context

So yksi ehto is something like:

• one term
• one condition
• one clause

In contract language, this is a very normal word.

It literally means one, but in many contexts Finnish uses yksi where English might simply say a or one for emphasis.

Here yksi ehto suggests:

• one particular clause/term
• a single clause
• some clause might go unnoticed

It highlights that even just one condition could be missed.

Without yksi, the tone would be a bit different.

This is a two-verb structure:

• voi = can / may / might
• jäädä = remain / be left

Together:

• voi jäädä = can remain / may be left / might end up

In this sentence, it leads into the idiomatic expression:

• jäädä huomaamatta

So the whole part means something like:

• might go unnoticed

Very literally, it means something like:

• to remain without being noticed

This is a very common Finnish expression.

Breakdown:

• jäädä = to remain, to be left
• huomaamatta = without noticing / unnoticed

So:

• ehto voi jäädä huomaamatta = a clause may go unnoticed

This is more natural in Finnish than trying to build a direct passive like English be noticed.

Huomaamatta is based on the verb huomata (to notice).

It is the third infinitive in the abessive case, a form that often expresses without doing something.

For example:

• syömättä = without eating
• sanomatta = without saying
• huomaamatta = without noticing

In this sentence, though, the expression jäädä huomaamatta is best learned as a whole chunk meaning:

• to go unnoticed

That is the most useful way to remember it.

Finnish often prefers idiomatic expressions like jäädä huomaamatta instead of building a passive exactly like English.

English says:

• may go unnoticed
• may not be noticed

Finnish very naturally says:

• voi jäädä huomaamatta

This is one of those expressions that is worth learning as a fixed pattern.

Other similar patterns exist too, such as:

• jäädä näkemättä = remain unseen / not get seen
• jäädä tekemättä = remain undone / not get done

Because Finnish does not need one here. The sentence structure is simply:

• Jos
  • condition clause,
• main clause

So:

• Jos en lue sopimusta tarkasti, yksi ehto voi jäädä huomaamatta.

That is just:

• If I don’t read the contract carefully, one clause may go unnoticed.

No extra linking word is needed.

Yes, Finnish word order is fairly flexible, although the given version is the most neutral.

For example, you could also say:

• Yksi ehto voi jäädä huomaamatta, jos en lue sopimusta tarkasti.

This means the same thing.

The difference is mainly about emphasis:

• Starting with Jos en lue... emphasizes the condition first.
• Starting with Yksi ehto... emphasizes the possible consequence first.

Because Finnish normally uses a comma between a subordinate clause and a main clause.

Here:

• Jos en lue sopimusta tarkasti = subordinate if clause
• yksi ehto voi jäädä huomaamatta = main clause

So the comma is standard Finnish punctuation.

In a sentence like this, yes. Jos is the normal word for a real or possible condition:

• Jos sataa, pysyn kotona. = If it rains, I’ll stay home.
• Jos en lue sopimusta tarkasti... = If I don’t read the contract carefully...

A learner may confuse jos with kun, but kun usually means when, not if.

So here jos is definitely the correct choice.

It can correspond to several English possibilities depending on context.

• voi literally often matches can
• but in this sentence it expresses possibility
• so in natural English, may or might is often better

So:

• yksi ehto voi jäädä huomaamatta

could be understood as:

• one clause can go unnoticed
• one clause may go unnoticed
• one clause might go unnoticed

In this sentence, may/might is probably the most natural interpretation.

Not in this exact sentence, because the clause is negative:

• en lue sopimusta

In a positive sentence, the case choice would depend on meaning:

• Luen sopimusta. = I am reading the contract / reading some of it
• Luen sopimuksen. = I read / will read the contract completely

But once the clause is negative, the object is partitive:

• En lue sopimusta.

So the sentence as given is correct.

It is quite neutral and perfectly natural standard Finnish.

Words like:

• sopimus = contract
• ehto = term/condition
• huomaamatta = unnoticed

make it suitable for normal written or spoken standard language. It is not overly formal, but it fits especially well in practical, legal, or professional contexts.