Marco possiede una casa.

Possiede is the he/she/it form of the verb possedere, which means to own or to possess.

So in Marco possiede una casa, possiede means owns.

A few related forms:

• io possiedo = I own
• tu possiedi = you own
• lui/lei possiede = he/she owns

Because possedere is the infinitive, meaning to own. In a normal sentence, Italian usually uses a conjugated form of the verb.

Since the subject is Marco = he, the verb must match he, so:

• Marco possiede = Marco owns

Using Marco possedere una casa would be ungrammatical, just like Marco to own a house in English.

Una is the feminine singular form of the indefinite article, meaning a or an.

• una casa = a house

Italian nouns have grammatical gender, and casa is feminine, so it takes una, not un.

In this sentence, you can tell because it uses the article una, which is feminine singular.

Also, many Italian nouns ending in -a are feminine:

• casa = house
• scuola = school
• porta = door

This is a common pattern, though not an absolute rule for every noun.

Yes. Marco ha una casa is very common and often more natural in everyday Italian.

The difference is roughly:

• Marco ha una casa = Marco has a house
• Marco possiede una casa = Marco owns a house

Possedere sounds a bit more explicit about legal ownership and can feel slightly more formal or emphatic than avere (to have).

Italian often leaves out subject pronouns when they are clear from the verb form.

So instead of saying:

• Lui possiede una casa

Italian often simply says:

• Possiede una casa

Or, with the name:

• Marco possiede una casa

The verb possiede already shows that the subject is he/she/it, so lui is usually unnecessary unless you want emphasis or contrast.

Yes, here it is the standard word order:

• Marco = subject
• possiede = verb
• una casa = object

So it follows the same basic pattern as English:

• Marco owns a house

Italian can sometimes change word order for emphasis, but this sentence uses the most neutral and common order.

Normally, no. You would usually need the article here:

• Marco possiede una casa

Without una, the sentence sounds incomplete or unnatural in standard Italian.

Italian uses articles very frequently, often more than English does.

It is present tense.

So the sentence means:

• Marco owns a house or, depending on context,
• Marco does own a house

It describes a present fact or general state.

A rough pronunciation is:

pos-SYEH-deh

A few notes:

• ss is pronounced like a strong s
• ie here sounds roughly like ye
• the stress is on sie: pos-SIE-de

And casa is roughly: KAH-za

So the whole sentence sounds roughly like: MAR-co pos-SYEH-deh OO-na KAH-za

In standard Italian, first names usually do not take an article in this kind of sentence.

So:

• Marco possiede una casa = correct

Using an article before Marco would generally sound nonstandard here, though some regional varieties of Italian do use articles with personal names in everyday speech.

Una casa is singular: a house.

The plural is:

• case = houses

So:

• una casa = a house
• due case = two houses
• Marco possiede due case = Marco owns two houses

Notice:

• singular feminine article: una
• plural feminine form: case

It is a normal verb, but in everyday conversation Italians often prefer avere unless they want to stress actual ownership.

So both are correct, but they feel slightly different:

• Ha una casa = very natural, everyday
• Possiede una casa = a bit more formal, precise, or emphatic about ownership

That makes possedere useful, but not always the first verb learners will hear in casual speech.