Spínač je vedle dveří.

Spínač means switch. In this sentence, it most naturally means the switch is next to the door.

A useful nuance:

• spínač = a general or technical switch
• vypínač = often the everyday word for a wall light switch

So this sentence is correct, but in everyday home-related speech, many Czechs might more naturally say vypínač je vedle dveří if they mean a light switch.

Je is the 3rd person singular form of the verb být (to be).

So:

• já jsem = I am
• ty jsi = you are
• on/ona/ono je = he/she/it is

In Spínač je vedle dveří, je means is.

Vedle means next to, beside, or alongside.

So:

• Spínač je vedle dveří. = The switch is next to the door.

It is a common preposition for physical position.

Because vedle requires the genitive case.

The basic form is:

• dveře = door / doors

But after vedle, it changes to:

• vedle dveří = next to the door

So the pattern is:

• vedle + genitive

Examples:

• vedle domu = next to the house
• vedle stolu = next to the table
• vedle dveří = next to the door

Because dveře is one of those Czech nouns that are grammatically plural only in normal usage. This is called pluralia tantum.

So even when English says the door as one object, Czech often uses:

• dveře

That is why you get forms like:

• nominative: dveře
• genitive: dveří

Even though the English translation is singular, the Czech noun behaves as plural.

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

Structure:

• Spínač = subject
• je = verb
• vedle dveří = location phrase

So the sentence literally works like:

• Switch is next to the door.

Because the verb agrees with the subject, not with the noun inside the prepositional phrase.

The subject is:

• spínač = singular

So the verb must be singular:

• je = is

The phrase vedle dveří is only giving location. It does not control the verb.

No. Czech does not use articles like a or the.

So:

• Spínač je vedle dveří.

can mean:

• The switch is next to the door.
• A switch is next to the door.

Which one is meant depends on context. In many situations, English will naturally translate it as the switch and the door.

Yes. Czech word order is more flexible than English.

The neutral order here is:

• Spínač je vedle dveří.

But you could also say:

• Vedle dveří je spínač.

That still means basically the same thing, but it puts more emphasis on the location next to the door.

So:

• Spínač je vedle dveří. = neutral, talking about the switch
• Vedle dveří je spínač. = more like Next to the door, there is a switch

A yes/no question can often be made just by intonation in speech, or by changing word order.

For example:

• Spínač je vedle dveří?
• Je spínač vedle dveří?

Both can mean:

• Is the switch next to the door?

The second version, with the verb first, looks more clearly like a question in writing.

A rough pronunciation guide:

• spínač ≈ spee-nach
• je ≈ yeh
• vedle ≈ ved-leh
• dveří ≈ dveh-zhee or dveh-rzhee depending on how accurately you do ř

A few important sounds:

• í is a long ee
• č sounds like ch in church
• j sounds like English y
• ř is the famous Czech sound; learners often approximate it at first

So a rough full pronunciation is:

• SPEE-nach yeh VED-leh dveh-rzhee

Good question. They are similar, but not identical.

• vedle dveří = next to the door, beside the door
• u dveří = by the door, at the door, near the door

So vedle is more specifically to the side of something, while u can be a little broader.

Examples:

• Spínač je vedle dveří. = The switch is next to the door.
• Stojím u dveří. = I am standing by the door.

Yes, it is grammatical and natural.

One small nuance is vocabulary:

• if you mean a general switch, spínač is fine
• if you specifically mean a household light switch, vypínač is often more everyday and natural

So both of these can work depending on context:

• Spínač je vedle dveří.
• Vypínač je vedle dveří.

Yes — that is a very good habit in Czech.

Do not just learn:

• vedle = next to

It is better to learn:

• vedle + genitive

That way you will naturally produce correct phrases like:

• vedle dveří
• vedle domu
• vedle školy

This is one of the most useful strategies for learning Czech prepositions.