Vidím ducha před domem.

In Czech, the subject pronoun is often omitted because the verb ending already shows who is doing the action.

• vidím = I see
• the ending -ím tells you it is 1st person singular

So Vidím ducha already means I see a ghost. You can add já if you want emphasis, contrast, or clarity:

• Já vidím ducha. = I see a ghost. / I am the one who sees a ghost.

Without emphasis, leaving já out is the most natural choice.

Vidím is the 1st person singular present tense of the verb vidět (to see).

A few forms:

• vidím = I see
• vidíš = you see
• vidí = he/she/it sees
• vidíme = we see
• vidíte = you all / formal you see
• vidí = they see

So the sentence starts with the verb I see.

Because ducha is the accusative singular form of duch.

In this sentence, duch is the direct object of the verb vidím, so it has to be in the accusative case.

• nominative: duch = a ghost
• accusative: ducha = a ghost (as the thing being seen)

This happens because duch is a masculine animate noun. For masculine animate nouns in Czech, the singular accusative often looks like the genitive:

• duch → ducha
• muž → muže
• student → studenta

So:

• Duch je tady. = The ghost is here. (subject, nominative)
• Vidím ducha. = I see a ghost. (object, accusative)

Yes, grammatically it is treated as masculine animate.

In Czech, animate is a grammatical category, not just a biological one. It includes many beings or person-like figures, such as:

• people
• animals
• some supernatural beings

So duch behaves like a masculine animate noun in declension, which is why the accusative is ducha.

Because the preposition před (in front of / before) here expresses location, and with that meaning it takes the instrumental case.

• před
  • instrumental = in front of
• dům = house
• instrumental singular of dům = domem

So:

• před domem = in front of the house

That is why you get domem, not dům or domu.

Domem is the instrumental singular of dům (house).

Useful forms of dům:

• nominative: dům
• genitive: domu
• dative: domu
• accusative: dům
• vocative: dome
• locative: domě / domu
• instrumental: domem

In this sentence, the preposition před requires the instrumental because it describes a location.

Not always. It depends on the meaning.

A very useful pattern is:

• před + instrumental = location
  před domem = in front of the house

• před + accusative = movement to a position in front of something
  před dům = to in front of the house

So compare:

• Stojím před domem. = I am standing in front of the house.
• Jdu před dům. = I am going to the area in front of the house.

In your sentence, there is no movement implied by před, only location, so the instrumental is used.

Most naturally, it describes where the ghost is:

• Vidím [ducha před domem].
• I see [a ghost in front of the house].

So the usual interpretation is I see a ghost that is in front of the house.

However, just like in English, context can sometimes make things ambiguous. If you wanted to make it clearer that you are in front of the house, Czech would often phrase it differently, for example:

• Před domem vidím ducha. = In front of the house, I see a ghost.

Even then, context still matters, but word order can help show what is being highlighted.

No, Czech word order is fairly flexible. The sentence Vidím ducha před domem. is natural and neutral, but other orders are possible.

For example:

• Vidím ducha před domem. = neutral
• Před domem vidím ducha. = emphasizes the location
• Ducha vidím před domem. = emphasizes the ghost
• Ducha před domem vidím. = possible, but more marked or literary

The endings show the grammatical roles, so Czech does not rely on word order as much as English does. Still, word order affects focus, emphasis, and what sounds most natural in context.

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

So ducha can mean:

• a ghost
• the ghost

Which one is meant depends on context.

Out of context, English often translates Vidím ducha as I see a ghost, because that sounds natural as a new piece of information. But in the right context it could just as well mean I see the ghost.

The same applies to domem:

• před domem can mean in front of a house or in front of the house, depending on context.

Yes, vidět is an imperfective verb.

In this sentence, that mainly means the present tense works normally:

• Vidím ducha. = I see a ghost.

A related perfective verb is often uvidět:

• Uvidím ducha. = I will see / catch sight of a ghost.

So:

• vidím = I see
• uvidím = I will see / I will catch sight of

For a learner, the key point here is simply that vidím is the normal present-tense form for I see.

A simple learner-friendly pronunciation guide would be:

• Vidím ≈ VI-deem
• ducha ≈ DOO-kha
  (with ch like the sound in German Bach or Scottish loch)
• před ≈ roughly przhed
  (the ř sound is special in Czech and takes practice)
• domem ≈ DO-mem

So the whole sentence is approximately:

VI-deem DOO-kha przhed DO-mem

The hardest part for most English speakers is ř in před. You do not need to master it immediately to understand the grammar of the sentence.

Duch can mean ghost, but also spirit, depending on context.

Common possibilities include:

• ghost in a spooky sense
• spirit
• sometimes more abstract meanings in certain expressions

In Vidím ducha, the most natural translation is usually I see a ghost. But in another context, duch could be understood differently.

Not ten duch in this sentence, because the noun has to match the case.

Since the object is accusative and duch is masculine animate, both the noun and the demonstrative must change:

• nominative: ten duch = that ghost
• accusative: toho ducha = that ghost

So you could say:

• Vidím toho ducha. = I see that ghost.

This is a good example of how Czech case affects not only nouns, but also words attached to them.