Technik konečně dorazil.

Czech has no articles like a / an / the.

So technik can mean:

• a technician
• the technician

You understand which one is meant from the context. In a sentence like Technik konečně dorazil, English will often use the technician because it sounds like a specific person both speaker and listener already know about.

Technik is in the nominative case, because it is the subject of the sentence — the person who arrived.

Its basic dictionary form is also technik.

The past tense in Czech agrees with the subject in gender and number.

• dorazil = masculine singular
• dorazila = feminine singular
• dorazilo = neuter singular

Since technik is a masculine noun, the correct form is dorazil.

Dorazil is the past tense of dorazit, which means to arrive, to show up, or to get there.

In this sentence it means that the technician finally arrived / finally showed up.

Compared with a very neutral verb like přišel (came) or přijel (arrived by vehicle), dorazil often feels a bit like made it there / showed up.

Dorazit is perfective.

That means it presents the action as completed: the technician reached the destination.

This fits well with konečně (finally), because the sentence focuses on the fact that the arrival happened at last.

The imperfective partner is usually dorážet, but in everyday speech that verb is much more often understood as to keep pressing / to pester / to attack, so for simple ongoing arrival contexts, learners more often meet other verbs instead.

Konečně means finally, and Czech word order is fairly flexible.

In Technik konečně dorazil, the placement sounds natural and neutral:

• Technik = topic / who we are talking about
• konečně = comment about the situation
• dorazil = main event

You can move konečně for emphasis, for example:

• Konečně dorazil technik. = stronger focus on finally
• Technik dorazil konečně. = possible, but less neutral in many contexts

So the original sentence is a very normal, natural order.

Usually yes, but the exact tone depends on context.

Here it suggests:

• the arrival was expected
• it took longer than hoped
• the speaker may feel relief, or sometimes mild annoyance

So Technik konečně dorazil can sound like:

• The technician finally arrived.
• At last, the technician showed up.

A rough English-friendly guide is:

TEKH-nik KO-nech-nye DO-ra-zil

A few details:

• ch in technik is like the ch in Scottish loch or German Bach
• čně in konečně can be tricky; it sounds roughly like ch-nye
• stress in Czech is normally on the first syllable of each word:
  • TEchnik
  • KOnečně
  • DOrazil

Yes, you could.

Ten technik literally means that technician, but in normal speech it can also work a bit like the technician, especially when pointing out a specific one.

Compare:

• Technik konečně dorazil. = neutral, natural
• Ten technik konečně dorazil. = more specific, slightly more pointed: that/the technician finally arrived

So the version without ten is often the best basic translation of the technician finally arrived.

Both can often be translated as The technician finally arrived.

But there is a slight difference in feel:

• přišel = literally came; very common and neutral, often suggests coming on foot unless context says otherwise
• dorazil = arrived / showed up / made it there; focuses more on reaching the place

So dorazil is a very natural choice when the important point is that the technician at last got there.

Usually not in this exact sentence, if you want to say the technician specifically.

You could say just:

• Konečně dorazil.

That means He finally arrived or He finally showed up, because the subject is understood from context.

But if you want to introduce or identify the person as the technician, then you keep technik:

• Technik konečně dorazil.