Řetěz potřebuje mazivo.

The hardest part is ř, a special Czech sound with no exact English equivalent. A useful beginner approximation is a quick blend of r and zh.

For řetěz:

• ře starts with that ř sound
• tě is a softened t sound, a bit like tye
• final z is pronounced like s at the end of the word, because Czech often devoices final consonants

So a rough learner-friendly approximation is rzhe-tyes. Don’t worry if your ř is not perfect yet; that is very normal for learners.

Potřebuje is the 3rd person singular present tense of the verb potřebovat, which means to need.

It matches the subject řetěz, which is singular:

• já potřebuji / potřebuju = I need
• ty potřebuješ = you need
• on/ona/ono potřebuje = he/she/it needs

So Řetěz potřebuje mazivo literally has the structure chain needs lubricant.

Mostly from the normal Czech word order and from meaning.

The neutral order is:

subject + verb + object

So:

• řetěz = subject
• potřebuje = verb
• mazivo = object

This sentence is a little tricky because the noun forms do not clearly show the roles by themselves:

• řetěz has the same form in nominative and accusative singular
• mazivo also has the same form in nominative and accusative singular

So here, word order is especially important.

After potřebovat, the thing that is needed is usually in the accusative case.

So in this sentence, mazivo is accusative singular.

It looks unchanged because mazivo is a neuter noun, and for many neuter nouns, nominative singular and accusative singular are identical.

So:

• nominative: mazivo
• accusative: mazivo

That is completely normal in Czech.

• řetěz is masculine inanimate
• mazivo is neuter

Gender matters because it affects:

• adjective endings
• pronouns
• some case endings
• verb agreement in the past tense

For example:

• nový řetěz = a new chain
• nové mazivo = new lubricant

Also, because řetěz is masculine inanimate, its accusative singular is the same as its nominative singular.

Czech has no articles.

So řetěz can mean:

• a chain
• the chain

and mazivo can mean:

• lubricant
• the lubricant
• some lubricant

The exact meaning depends on context. If Czech needs to be more specific, it often uses:

• context
• word order
• demonstratives such as ten

Yes, Czech word order is more flexible than English word order. But Řetěz potřebuje mazivo is the most neutral and natural version.

Changing the order can change the emphasis. However, in this particular sentence, changing the order can also make things less clear, because both nouns have forms that could be nominative or accusative.

So for a learner, the safest choice is to keep:

Řetěz potřebuje mazivo.

Yes. Mazivo usually means a lubricating substance in a general sense, such as lubricant, grease, or something used for lubrication.

So the sentence means the chain needs some kind of lubricant, not necessarily one single countable object.

That is why English might translate it naturally as:

• The chain needs lubricant
• The chain needs some grease
• The chain needs oil

depending on context.

Yes, absolutely. Czech uses potřebovat very naturally with non-human subjects.

So sentences like these are normal:

• Auto potřebuje opravu. = The car needs a repair.
• Květina potřebuje vodu. = The flower needs water.
• Řetěz potřebuje mazivo. = The chain needs lubricant.

This works much like English need in sentences such as The car needs fuel or The plant needs water.