L'edificio ha molte finestre.

Because l' is the shortened form of the definite article il before a word that begins with a vowel.

• il edificio becomes l'edificio
• This is called elision

Since edificio is masculine singular, the full article would normally be il, but before e- it changes to l'.

Edificio is masculine.

That is why the article is l' (short for il) and not a feminine article.

Examples:

• l'edificio = the building
• un edificio = a building

Even though some nouns ending in -o are masculine and some ending in -a are feminine, edificio follows the common pattern: -o usually suggests masculine.

Because ha is the third-person singular form of the verb avere (to have).

• io ho = I have
• tu hai = you have
• lui/lei ha = he/she has

The h is written but not pronounced. It helps distinguish the verb forms from other short words:

• ha = has
• a = to / at

So in this sentence, ha means has.

Because the subject is l'edificio, which is singular: the building.

In English:

• the building has not
• the building have

Italian works the same way here:

• l'edificio ha = the building has

If the subject were plural, you would use hanno:

• Gli edifici hanno molte finestre = The buildings have many windows

Because molte must agree with finestre, which is feminine plural.

Forms of molto as an adjective:

• molto = masculine singular
• molta = feminine singular
• molti = masculine plural
• molte = feminine plural

Since finestre is feminine plural, the correct form is molte.

The singular is finestra = window.

To make it plural:

• finestra → finestre

This is a very common pattern for feminine nouns ending in -a:

• singular: -a
• plural: -e

Examples:

• porta → porte
• camera → camere
• finestra → finestre

So molte finestre means many windows.

Because in Italian, when you mean many windows in a general counting sense, you normally do not need a definite article.

• ha molte finestre = has many windows

If you added an article, the meaning would change and sound more specific:

• ha le molte finestre would not be normal here

So molte finestre works like English many windows.

Yes. Molte and tante can both mean many in this kind of sentence.

• L'edificio ha molte finestre
• L'edificio ha tante finestre

Both are correct. Very generally:

• molte can sound a little more neutral or standard
• tante can sometimes feel a bit more emphatic or conversational

But in everyday use, both are common.

The normal, neutral word order is:

• L'edificio ha molte finestre

Italian can change word order for emphasis, but Molte finestre ha l'edificio sounds marked or literary, not the usual everyday choice.

For learners, the best version to use is the standard one:

• subject + verb + object

So stick with L'edificio ha molte finestre unless you have a special reason to emphasize something.

A simple pronunciation guide is:

leh-dee-FEE-cho ah MOL-teh fee-NES-treh

A few helpful points:

• l'edificio links smoothly together
• ci in edificio sounds like cho in church, but softer: -cio
• the h in ha is silent
• finestre has three syllables: fi-ne-stre

If you want to sound natural, try saying it in smooth groups:

• L'edificio | ha molte finestre

It is very close in meaning, but not exactly the same structure.

• L'edificio ha molte finestre literally means The building has many windows
• Ci sono molte finestre nell'edificio means There are many windows in the building

In many situations, the practical meaning is similar. But Italian is using avere (to have) here, just as English often does with buildings, houses, rooms, and objects:

• The house has a garden
• La casa ha un giardino

So the sentence is best understood grammatically as The building has many windows.