Il parco divertimenti apre alle nove.

Il is the definite article, meaning the. Italian usually uses articles more often than English does, so il parco divertimenti is the normal way to say the amusement park.

If you removed il, the phrase would sound less complete in most ordinary contexts unless it were being used in a headline, list, or very specific style.

Both ideas exist in Italian, but parco divertimenti is a standard expression meaning amusement park. Literally, it looks like park + amusements/entertainments.

Italian often makes compound nouns this way, with one noun modifying another directly:

• parco divertimenti
• ufficio stampa
• sala giochi

So yes, divertimenti is plural, and that is normal in this expression.

Apre means opens.

It comes from the verb aprire = to open.

So:

• Il parco divertimenti apre alle nove = The amusement park opens at nine

In other contexts, aprire can also mean:

• to open a door
• to open a shop
• to begin an event or season

Here it refers to opening for business.

Because the subject is singular: il parco divertimenti.

The main noun is parco, which is singular, so the verb must also be singular:

• il parco ... apre = the park opens
• i parchi ... aprono = the parks open

Even though divertimenti is plural, it is only part of the compound noun. The head noun is parco, and that is what controls the verb.

It is the present tense, third person singular, of aprire.

Conjugation:

• io apro
• tu apri
• lui/lei apre
• noi apriamo
• voi aprite
• loro aprono

Italian often uses the present tense for scheduled events and general facts, just like English:

• Il museo apre alle dieci = The museum opens at ten

Because alle is the normal form used before a plural hour.

Alle = a + le

Italian tells time like this:

• all’una = at one
• alle due = at two
• alle tre = at three
• alle nove = at nine

You use all’ with una because it is singular:

• all’una

But from due onward, the understood noun is plural, so Italian uses alle.

Italian normally just uses the number:

• alle nove
• alle dieci
• alle tre

There is no need for a separate word like o’clock in ordinary speech.

If you want to be more precise, you can add:

• alle nove in punto = at exactly nine
• alle nove di mattina = at nine in the morning
• alle nove di sera = at nine in the evening

Yes. By itself, alle nove just means at nine. Context usually makes it clear.

If needed, Italian can specify:

• alle nove di mattina = at 9 a.m.
• alle nove di sera = at 9 p.m.
• alle ventuno = at 21:00, especially in formal timetables

For an amusement park, people would normally assume the opening time is in the morning unless context suggests otherwise.

A simple pronunciation guide is:

eel PAR-ko dee-ver-tee-MEN-tee AH-preh AL-leh NO-veh

A few notes:

• il sounds like eel
• parco has a hard c sound: PAR-ko
• divertimenti has stress on men
• apre is AH-preh
• alle has two l sounds held a bit longer than in English
• nove is NO-veh

This is the normal, straightforward order:

subject + verb + time expression

• Il parco divertimenti = subject
• apre = verb
• alle nove = time

Italian can move things around for emphasis, for example:

• Alle nove apre il parco divertimenti

That still means the same thing, but the original sentence is the most neutral version.

Yes, luna park is also used in Italian and often means amusement park or fairground. But it is not always exactly the same in tone or usage as parco divertimenti.

Very roughly:

• parco divertimenti = amusement park
• luna park = fairground / amusement park, often a bit more informal or traditional-sounding depending on context

So Il parco divertimenti apre alle nove is a very good neutral sentence.

Because parco divertimenti functions as a fixed compound noun. Italian often joins nouns directly without di.

Compare:

• parco divertimenti = amusement park
• sala giochi = game room / arcade
• centro città = city center

Sometimes Italian does use di, but not in every noun combination. In this case, the direct compound is the standard expression.

You would make both the article and the main noun plural, and the verb would also become plural:

I parchi divertimenti aprono alle nove.

Changes:

• il → i
• parco → parchi
• apre → aprono

Notice that divertimenti stays the same, because it is already plural.