Spoluhráč našel stopu.

• spoluhráč = teammate / fellow player
• našel = found
• stopu = a clue / a track / a trace, depending on context

Grammatically:

• spoluhráč is the subject
• našel is the verb
• stopu is the direct object

So the structure is basically the same as English: subject + verb + object.

Because stopu is the accusative singular form of stopa.

The verb najít / našel takes a direct object, and direct objects in Czech usually go in the accusative case.

Here:

• nominative: stopa
• accusative: stopu

This is very common with feminine nouns ending in -a:

• žena → ženu
• kniha → knihu
• stopa → stopu

Spoluhráč is in the nominative singular because it is the subject of the sentence.

The person doing the action is normally in the nominative:

• Spoluhráč našel stopu.
• Pes našel míč.
• Kamarád otevřel dveře.

So here, spoluhráč is the one who found something.

Našel is the past tense masculine singular form of najít, which means to find.

In Czech past tense, the verb agrees with the subject in gender and number.

For najít, the past forms are:

• masculine singular: našel
• feminine singular: našla
• neuter singular: našlo
• plural masculine animate: našli
• plural non-masculine animate: našly

So with spoluhráč as a masculine singular noun, našel is the correct form.

It shows masculine grammatical gender, which in this sentence strongly suggests a male teammate.

• spoluhráč is masculine
• therefore the verb is našel

If the teammate were female, you would normally say:

• Spoluhráčka našla stopu.

So yes, in normal usage this sentence points to a male teammate.

In Czech past tense, the form works differently from English.

The full past tense historically includes an auxiliary related to to be, but in the 3rd person it is not expressed separately. So:

• on našel = he found / he has found
• ona našla = she found / she has found

There is no separate visible word for has in this sentence.

This is normal in Czech:

• Našel stopu. = He found a clue / He has found a clue

The exact English translation depends on context.

Najít is perfective.

That matters because Czech aspect tells you whether the action is seen as:

• completed / achieved → perfective
• ongoing / repeated / habitual → imperfective

Here, našel means the teammate successfully found the clue. It presents the action as completed.

Useful contrast:

• našel stopu = he found the clue / he managed to find a clue
• hledal stopu = he was looking for a clue
• nacházel stopu can be used in special contexts, but hledat is the more natural everyday verb for to look for

So našel focuses on the result, not the process.

Czech word order is much more flexible than English.

Spoluhráč našel stopu is the most neutral version.

But other orders are possible, for example:

• Stopu našel spoluhráč.
• Našel stopu spoluhráč.

These alternatives change the emphasis or information focus, not the basic meaning.

Very roughly:

• Spoluhráč našel stopu = neutral statement
• Stopu našel spoluhráč = emphasis on the clue
• Našel stopu spoluhráč = can sound contrastive or context-driven

So yes, the order can change, but the neutral learner-friendly version is the one you were given.

Spoluhráč is a compound-like formation:

• spolu- = together / co-
• hráč = player

So spoluhráč literally means something like co-player or player together with someone, which becomes teammate / fellow player in natural English.

Czech often builds words this way, and they are commonly written as one word.

Related words:

• hráč = player
• spolužák = classmate
• spolubydlící = roommate / flatmate

A rough pronunciation guide:

• Spoluhráč ≈ SPO-loo-hraach
• našel ≈ NA-shel
• stopu ≈ STO-poo

A few important points:

• Czech stress is usually on the first syllable of each word:
  • SPOluhráč
  • NAšel
  • STOpu
• š sounds like sh
• č sounds like ch in church
• á is a long vowel
• h is a real h sound

So the whole sentence is roughly: SPO-loo-hraach NA-shel STO-poo

Because Czech has no articles.

English distinguishes:

• a clue
• the clue

Czech usually does not mark that difference with a separate word. So stopu can mean:

• a clue
• the clue
• sometimes even some trace

The exact meaning comes from context.

That is completely normal in Czech:

• Vidím dům = I see a/the house
• Našel stopu = He found a/the clue

It is a masculine animate noun.

That matters because masculine animate nouns often have special patterns in declension and agreement.

For example:

• nominative singular: spoluhráč
• accusative singular: spoluhráče

And the verb agrees with its masculine gender:

• Spoluhráč našel stopu.

If it were plural:

• Spoluhráči našli stopu.

So learning that spoluhráč is masculine animate will help you predict other forms later.