Našel jsem nesrovnalost.

Because Czech often drops subject pronouns when they are clear from the verb form.

In Našel jsem, the word jsem already tells you the subject is I. So já is unnecessary unless you want emphasis or contrast.

• Neutral: Našel jsem nesrovnalost. = I found a discrepancy.
• Emphatic: Já jsem našel nesrovnalost. = I found a discrepancy.

This is very common in Czech.

Czech past tense is usually made with:

• a past participle (here našel)
• plus an auxiliary form of být = to be (here jsem)

So:

• našel = found (masculine singular form)
• jsem = I am / auxiliary for I in the past tense

Together, našel jsem = I found.

For comparison:

• našel jsem = I found (male speaker)
• našla jsem = I found (female speaker)
• našli jsme = we found

Because našel is the masculine singular past form.

In Czech, past tense agrees with the gender and number of the subject:

• našel jsem = I found (said by a man)
• našla jsem = I found (said by a woman)

So if the speaker is male, našel is correct. If the speaker is female, the sentence would be:

Našla jsem nesrovnalost.

Because jsem is a clitic, and Czech clitics usually go in second position in the clause.

So in:

Našel jsem nesrovnalost.

the first element is Našel, and the clitic jsem comes right after it.

This is normal Czech word order. You would not usually say:

• Jsem našel nesrovnalost. ❌

But you can say:

• Já jsem našel nesrovnalost. ✔

Here Já is in first position, so jsem is second.

It is in the accusative singular, because it is the direct object of the verb found.

You found what?
→ nesrovnalost

So it must be accusative.

The tricky part is that nesrovnalost looks the same in the nominative and accusative singular. That is normal for many feminine nouns ending in -ost.

For example:

• nominative: Ta nesrovnalost je vážná. = The discrepancy is serious.
• accusative: Našel jsem nesrovnalost. = I found a discrepancy.

Same form, different case function.

It is a feminine noun ending in -ost, a very common Czech noun ending for abstract ideas.

Here it means something like:

• discrepancy
• inconsistency
• irregularity

It is declined like other feminine -ost nouns.

A few useful forms:

• nominative singular: nesrovnalost
• genitive singular: nesrovnalosti
• nominative plural: nesrovnalosti
• genitive plural: nesrovnalostí

Not exactly.

• chyba usually means mistake, error, or fault
• nesrovnalost usually means discrepancy, inconsistency, or something that doesn’t match up

So nesrovnalost often sounds a bit more formal or analytical.

For example:

• A wrong answer on a test could be a chyba.
• A mismatch in records, numbers, or statements could be a nesrovnalost.

So this sentence suggests the speaker found something that doesn’t line up correctly, rather than just a simple mistake.

The infinitive is najít, meaning to find.

This verb is a bit irregular, so the forms do not all look similar:

• infinitive: najít
• past masculine singular: našel
• present/future form: najdu = I will find / I find

So yes, it is normal that našel looks quite different from najít.

Also, najít is perfective, so it expresses a completed result: the speaker successfully found something.

Yes, Czech word order is flexible, but the meaning or emphasis can change.

The neutral version is:

• Našel jsem nesrovnalost.

You could also say:

• Nesrovnalost jsem našel.

This puts more emphasis on nesrovnalost.

Or:

• Já jsem našel nesrovnalost.

This emphasizes I.

So the basic meaning stays similar, but the focus changes. Czech uses word order a lot for emphasis and information structure.

Roughly:

NA-shel jsem NE-srov-na-lost

A few tips:

• Czech stress is usually on the first syllable of a word.
• š sounds like sh in shoe.
• jsem is often pronounced with a weak j, and in casual speech it may sound almost like sem.
• c is not present here, so nothing tricky like ts occurs.

So:

• Našel ≈ NA-shel
• jsem ≈ ysem or almost sem
• nesrovnalost ≈ NE-srov-na-lost

Czech has no articles like a or the, so the sentence itself does not explicitly mark that distinction.

So Našel jsem nesrovnalost could mean:

• I found a discrepancy
• I found the discrepancy

Which one is meant depends on the context.

Without special context, English would often translate it as I found a discrepancy.