Το λάστιχο έχει ένα σημάδι.

Because το is the definite article, meaning the.

• το λάστιχο = the tire / the rubber object
• Without the article, λάστιχο would sound less natural here unless you were speaking in a very special context, like labels, notes, or very telegraphic speech.

Greek uses articles very often, sometimes more often than English does. So if you mean a specific tire, το λάστιχο is the normal way to say it.

Λάστιχο is a neuter noun, so it takes the neuter article το.

In dictionary form, you would usually see it as:

• το λάστιχο

A lot of Greek nouns ending in -ο are neuter, and λάστιχο is one of them. Because it is neuter:

• το λάστιχο = the tire
• ένα λάστιχο = a tire

So the article and any related words must match the noun’s gender.

Because the subject is το λάστιχο, which is third person singular: it.

The verb έχω means to have, and here are the main present-tense forms:

• έχω = I have
• έχεις = you have
• έχει = he/she/it has
• έχουμε = we have
• έχετε = you all have
• έχουν(ε) = they have

So:

• Το λάστιχο έχει... = The tire has...

If you said έχω, that would mean I have, so it would not match the subject.

Because σημάδι is also a neuter noun.

So the indefinite article must also be neuter:

• ένας = a, an for masculine nouns
• μια / μία = a, an for feminine nouns
• ένα = a, an for neuter nouns

Since σημάδι is neuter, you say:

• ένα σημάδι = a mark

not:

• ένας σημάδι
• μια σημάδι

In this sentence, σημάδι is the direct object of the verb έχει.

Greek does have cases, but for many neuter nouns, the nominative and accusative forms are the same. That is why σημάδι looks unchanged.

So:

• nominative: το σημάδι
• accusative: το σημάδι

This is very common with neuter nouns, and it often makes them easier for learners.

The basic order is:

• Το λάστιχο = subject
• έχει = verb
• ένα σημάδι = object

So the sentence follows a very familiar pattern:

Subject + Verb + Object

That is one reason this sentence feels straightforward to English speakers.

Greek word order is more flexible than English word order, but this version is the most neutral and natural one in most situations.

Yes, Greek allows more flexibility than English.

For example, you might also hear:

• Ένα σημάδι έχει το λάστιχο.
• Το λάστιχο ένα σημάδι έχει.

But these versions usually add some emphasis, contrast, or a particular tone. The most neutral sentence is still:

• Το λάστιχο έχει ένα σημάδι.

So as a learner, it is best to treat this as the standard pattern.

The stress marks show you which syllable is stressed:

• λάστιχο → stress on λά-
• σημάδι → stress on -μά-
• έχει → stress on έ-

A rough pronunciation guide:

• λάστιχο ≈ LAS-ti-ho
• έχει ≈ E-hi
• ένα ≈ E-na
• σημάδι ≈ si-MA-thi

A few useful sound notes:

• χ is like the h-like sound in Scottish loch or German Bach, not an English ch
• δ in σημάδι sounds like the th in this, not like English d

Not always. Λάστιχο can have several related meanings depending on context, such as:

• tire
• rubber
• hose
• elastic band

So the exact meaning depends on the situation.

In this sentence, if the meaning shown to you is tire, that is the meaning you should use here. But it is good to know that the Greek word is broader than a single English word.

Because Greek usually does not need an explicit subject pronoun when the verb form already shows the person and number.

In English, you must say:

• It has a mark.

In Greek, the verb form έχει already tells you it is he/she/it has, so a separate it is often unnecessary.

And in this sentence, the noun το λάστιχο is already stated, so there is even less need for a pronoun.

Usually, yes. In this sentence, ένα works just like a in English:

• ένα σημάδι = a mark

But remember that ένα must agree with the noun’s gender, so it is specifically the neuter form of a/an.

Also, Greek sometimes uses the indefinite article a little differently from English in some contexts, but in a simple sentence like this, it matches very well.

Yes — that is a very good habit in Greek.

Instead of learning nouns as:

• λάστιχο
• σημάδι

learn them as:

• το λάστιχο
• το σημάδι

This helps you remember:

• the noun’s gender
• which article it takes
• how other words will agree with it

That habit will save you a lot of confusion later.

Yes, in some contexts ένα can mean either a/an or one.

Usually, the context tells you which meaning is intended.

In a neutral sentence like this, ένα σημάδι is normally understood as:

• a mark

If you wanted to strongly emphasize the number one, your voice or the context would usually make that clearer.