Vodítko je u dveří.

Because the subject is vodítko, which is singular.

• vodítko = one leash / lead
• je = is (3rd person singular of být, to be)
• jsou would be are, used with a plural subject

So:

• Vodítko je u dveří. = The leash is by the door.
• Vodítka jsou u dveří. = The leashes are by the door.

The preposition u usually means by, at, near, or next to, depending on context.

In this sentence, u dveří means something like:

• by the door
• at the door
• near the door

It does not necessarily mean the leash is touching the door. It just places it in that area.

A very important grammar point: u takes the genitive case.

So after u, the noun has to be in the genitive:

• dveře → dveří

Because u requires the genitive case, and dveří is the genitive form.

The basic dictionary form is:

• dveře = door

But after u, you need:

• u dveří = by the door

So:

• dveře = nominative
• dveří = genitive

That is why the sentence is u dveří, not u dveře.

This is a very common question. Dveře is one of those Czech nouns that is normally used only in the plural form, even when English uses a singular word.

So although English says door, Czech says dveře, which is grammatically plural in form.

This kind of noun is called pluralia tantum.

Examples:

• Ty dveře jsou otevřené. = The door is open.
• Jdu ke dveřím. = I’m going to the door.

So in your sentence:

• u dveří is literally something like by the doors in form,
• but in normal English translation it is simply by the door.

Vodítko is a neuter noun.

It usually means:

• leash
• lead (especially British English)
• often a dog leash

Its grammatical details:

• gender: neuter
• number here: singular
• case here: nominative, because it is the subject of the sentence

The ending -ko is very common in neuter nouns.

You may also notice that it is related to the verb vodit = to lead, to take/guide someone somewhere.

You can tell because:

1. It is in the nominative case
2. The verb je agrees with it in singular
3. It is the thing being described as being somewhere

So the structure is:

• Vodítko = subject
• je = verb
• u dveří = location phrase

In English order:

• The leash is by the door.

Yes. That is perfectly natural Czech.

Czech word order is more flexible than English because the cases help show the grammatical role of each word.

So both are correct:

• Vodítko je u dveří.
• U dveří je vodítko.

The difference is mainly emphasis:

• Vodítko je u dveří. focuses more naturally on the leash
• U dveří je vodítko. focuses more on where it is

English usually cannot move words around as freely without sounding marked.

Because Czech normally does not use articles like English a and the.

So:

• vodítko can mean a leash or the leash
• dveří can mean a door or the door

The exact meaning depends on context.

That is normal in Czech. If the speaker wants to be more specific, they usually do it through context, word order, or additional words, not with articles.

A helpful approximate pronunciation is:

VOH-deet-koh ye oo DVEH-rzhee

A few details:

• v = like English v
• o = short o
• dí = long dee
• ť = a softened t sound
• je = ye
• u = oo
• dv at the start of dveří is pronounced together
• ř is the famous Czech sound, a kind of rolled/rzh sound; learners often approximate it as rzh

So dveří is the trickiest part.

Not exactly.

• u dveří = by/at the door, a general location near the door
• vedle dveří = next to the door, more specifically beside it

So u is broader and more natural in many everyday situations.

Compare:

• Vodítko je u dveří. = The leash is by the door.
• Vodítko je vedle dveří. = The leash is next to the door.

The second one sounds more spatially precise.

Here is the full breakdown:

• Vodítko — nominative singular

  • subject of the sentence
  • neuter noun

• je — present tense, 3rd person singular of být

  • means is

• u — preposition

  • takes the genitive

• dveří — genitive plural of dveře

  • used because of u
  • dveře is a plural-form noun meaning door

So the grammar pattern is:

[subject in nominative] + [to be] + [u + genitive]