Našel jsem list v zahradě.

Czech past tense is built with:

• a past participle: našel = found
• a form of být (to be) used as an auxiliary: jsem = I am / I have in this construction

So:

• našel jsem = I found

The participle agrees with the subject’s gender and number:

• Našel jsem = said by a man
• Našla jsem = said by a woman
• Našli jsme = we found (masculine animate or mixed group)
• Našly jsme = we found (all-female group, or non-masculine-animate in some contexts)

So in your sentence, Našel jsem tells you the speaker is masculine singular.

In Czech, short unstressed words called clitics often go in the second position of the sentence or clause. Jsem is one of them.

So Našel jsem list v zahradě. is completely normal.

You can compare:

• Našel jsem list v zahradě.
• V zahradě jsem našel list.

In both sentences, jsem comes after the first element of the clause.

English speakers often expect something like I have found, with the auxiliary first, but Czech works differently.

Here list is in the accusative singular, because it is the direct object of found.

The verb najít / našel usually takes an object in the accusative:

• našel jsem list = I found a leaf / sheet / page

For this noun, the accusative singular looks the same as the nominative singular:

• nominative: list
• accusative: list

That is very common with masculine inanimate nouns in Czech.

List is a somewhat ambiguous Czech word. Depending on context, it can mean:

• leaf
• sheet
• page
• in some contexts, part of a plant or a flat piece of something

It does not usually mean a letter in the modern everyday sense; that is more commonly dopis.

So Našel jsem list v zahradě most naturally suggests:

• I found a leaf in the garden

But if the wider context were different, it could also be understood as a sheet or a page.

Because after v meaning in, Czech uses the locative case.

The noun zahrada (garden) changes like this:

• nominative: zahrada
• locative singular: zahradě

So:

• v zahradě = in the garden

You cannot use the plain dictionary form zahrada after v in this meaning.

Here v takes the locative, because it means in and describes location.

So:

• v zahradě = in the garden

A useful basic rule:

• v + locative = location, being somewhere

For example:

• v domě = in the house
• v autě = in the car
• v Praze = in Prague

Czech has no articles like English a/an and the.

So list can mean:

• a leaf
• the leaf

And v zahradě can mean:

• in a garden
• in the garden

Which one is meant depends on context.

That means the English translation may need an article even though Czech does not show one.

Yes. Czech word order is relatively flexible, because case endings show grammatical roles.

Possible versions include:

• Našel jsem list v zahradě.
• V zahradě jsem našel list.
• List jsem našel v zahradě.

All can mean roughly I found a leaf in the garden, but the emphasis changes:

• Našel jsem list v zahradě. = neutral
• V zahradě jsem našel list. = emphasizes in the garden
• List jsem našel v zahradě. = emphasizes the leaf

So Czech word order often reflects topic and focus, not just grammar.

A woman would say:

• Našla jsem list v zahradě.

The only change is the past participle:

• masculine singular: našel
• feminine singular: našla

The auxiliary jsem stays the same.

Yes, it matters. Našel comes from najít, which is perfective.

That means it presents the action as completed:

• Našel jsem list = I found a leaf / I succeeded in finding it

The imperfective partner is nacházet / nacházel or nacházet in broader usage, but in simple past narration you would more often compare with verbs like:

• hledal jsem list = I was looking for a leaf
• našel jsem list = I found a leaf

So našel jsem focuses on the completed result.

A careful approximation is:

• Našel jsem list v zahradě
• roughly: NAH-shel sem leest v ZAHRA-dye

A few helpful notes:

• š sounds like sh in shoe
• jsem is often pronounced close to sem in normal speech
• i in list is like ee in machine
• dě in zahradě is a soft sound, roughly dye

Also, Czech stress usually falls on the first syllable of each word:

• NAšel
• LIST
• ZAhradě

Because some Czech nouns have the same form in nominative and accusative.

List is a masculine inanimate noun, and in the singular its accusative matches the nominative:

• nominative: list
• accusative: list

So even though it is the object, the form stays the same.

This is different from many feminine nouns, where the accusative often looks different:

• zahrada → zahradu in the accusative

That is why learners sometimes feel that list should change here, but in fact it is already in the correct form.