Mazlíček spí v pokoji.

Mazlíček most commonly means pet.

It comes from the idea of something or someone you cuddle or are affectionate with, so depending on context it can sometimes sound a little like darling or favorite little one, but in a basic sentence like this, pet is the natural meaning.

Examples:

• mazlíček = pet
• domácí mazlíček = domestic pet / household pet

Because spí is a conjugated verb form, while spát is the infinitive.

• spát = to sleep
• spí = sleeps / is sleeping

In this sentence, the subject is mazlíček, which is 3rd person singular, so Czech uses:

• spát → spí

So:

• Mazlíček spí. = The pet sleeps / is sleeping.

Czech does not have articles like English a, an, or the.

So Mazlíček spí v pokoji could mean:

• The pet is sleeping in the room
• A pet is sleeping in a room

Which one sounds best depends on the context.

Czech usually lets context do the work that English articles do.

Because the preposition v meaning in requires the noun to be in the locative case when it describes location.

The base form is:

• pokoj = room

But after v for location, it changes to:

• v pokoji = in the room

So:

• pokoj = nominative
• v pokoji = locative

This is a very common Czech pattern:

• v domě = in the house
• ve škole = in the school
• v pokoji = in the room

Pokoji is in the locative singular.

The noun pokoj is masculine inanimate, and here it follows v, which triggers the locative when talking about location.

So the grammar is:

• v
  • locative = in / inside / at

That is why pokoj becomes pokoji.

In this sentence, v means in.

So:

• v pokoji = in the room

But v can also sometimes correspond to English at or other location expressions depending on context.

For example:

• ve škole = at school / in the school
• v Praze = in Prague
• v práci = at work

So the core idea is inside / within / at a location, and English may translate it differently depending on what sounds natural.

Because Czech usually does not need an explicit subject pronoun when the subject is already stated or understood.

Here the subject is the noun mazlíček, so there is no need to add anything else.

English:

• The pet is sleeping.

Czech:

• Mazlíček spí.

If you added a pronoun as well, it would usually be unnecessary unless you wanted emphasis.

Yes. Spí is present tense, and in Czech the present tense often covers both:

• sleeps
• is sleeping

So Mazlíček spí v pokoji can mean:

• The pet sleeps in the room (habitual)
• The pet is sleeping in the room (right now)

Context tells you which meaning is intended.

Yes. Czech word order is more flexible than English word order.

The neutral order here is:

• Mazlíček spí v pokoji.

But you could also hear:

• V pokoji spí mazlíček.
• Spí v pokoji. if the subject is already understood

Changing the order usually changes emphasis, not the core meaning.

For example:

• Mazlíček spí v pokoji. = neutral statement
• V pokoji spí mazlíček. = emphasis on where the pet is sleeping

A rough English-friendly guide:

• Mazlíček ≈ MAZ-lee-chek
• spí ≈ spee
• v pokoji ≈ f PO-ko-yi

A few useful notes:

• Czech stress is usually on the first syllable of each word.
• í is a long ee sound.
• č sounds like ch in check.
• In normal speech, v before a voiceless consonant like p is often pronounced more like f, so v pokoji may sound like f pokoji.

Yes. Pokoj is a very common word for room.

Examples:

• pokoj = room
• obývací pokoj = living room
• dětský pokoj = children’s room
• hotelový pokoj = hotel room

So v pokoji is a very normal way to say in the room.

Grammatically, mazlíček is a masculine noun.

That does not necessarily mean the actual animal is male. Czech grammar and biological sex do not always match.

If you specifically wanted a feminine noun, you might use a different word depending on the animal:

• kočka = female cat / cat
• fenka = female dog

But mazlíček as a general word for pet is perfectly normal regardless of whether the pet is male or female in real life.

Not by itself. Mazlíček just means pet.

If you wanted to say my pet, you would normally say:

• Můj mazlíček spí v pokoji.

Without můj, the sentence simply says:

• A/The pet is sleeping in the room

So possession is not automatically included. It would need to be added if important.