La urbo havas mil restoraciojn.

Because it contains two endings at once:

• -j marks the plural
• -n marks the accusative, which usually shows the direct object

So:

• restoracio = restaurant
• restoracioj = restaurants
• restoraciojn = restaurants, as the thing being had

In this sentence, the city is the subject, and the restaurants are the direct object of havas, so -n is needed.

Because mil means one thousand, so the noun refers to many items.

In Esperanto, nouns after cardinal numbers are normally plural when more than one thing is meant:

• unu restoracio = one restaurant
• du restoracioj = two restaurants
• mil restoracioj = a thousand restaurants

In this sentence, that plural form also gets -n, giving restoraciojn.

No. Esperanto verbs do not change according to the subject.

The present tense always ends in -as:

• mi havas = I have
• vi havas = you have
• li havas = he has
• la urbo havas = the city has

So havas is used no matter who or what the subject is.

La is the definite article, meaning something like the.

So la urbo means the city, not just a city or city in general. It suggests that the city is specific or already known from context.

A few useful points:

• Esperanto has only one definite article: la
• It does not change for gender, number, or case
• So it stays la in all situations

Because Esperanto has no indefinite article.

So where English says:

• a city
• a restaurant

Esperanto simply says:

• urbo
• restoracio

That means La urbo havas mil restoraciojn is perfectly normal without any word corresponding to a before mil restoraciojn.

Normally, no. After a plain number like mil, you usually put the noun directly:

• mil restoracioj

The word da is used after words showing quantity, measure, or amount, such as:

• multe da restoracioj = many restaurants
• glaso da akvo = a glass of water
• kilo da pomoj = a kilo of apples

So here mil restoraciojn is the normal form, not mil da restoracioj.

The normal, most neutral order is:

• subject + verb + object

So:

• La urbo = subject
• havas = verb
• mil restoraciojn = object

That makes this sentence very straightforward.

Esperanto word order is somewhat flexible, especially because the -n ending helps show the object, but this version is the most natural basic order for a learner to use.

Because nouns in Esperanto normally end in -o.

For example:

• urbo = city
• restoracio = restaurant
• domo = house

This is one of the most regular parts of Esperanto grammar. Once you know a word is a noun, you usually expect it to end in -o.

Then other endings can be added:

• -j for plural
• -n for accusative

So restoraciojn is built from the noun restoracio plus -j plus -n.

As a basic numeral, mil usually stays the same.

So you say:

• mil restoracioj
• mil homoj
• mil domoj

You may sometimes see miloj, but that means thousands, not exactly one thousand. For example:

• miloj da homoj = thousands of people

So in your sentence, mil is the correct form because it means exactly one thousand.

Yes. Esperanto often allows more than one natural way to express the same idea. For example:

• Estas mil restoracioj en la urbo. = There are a thousand restaurants in the city.

But La urbo havas mil restoraciojn is also perfectly good Esperanto. It simply uses the verb havi = to have.

Yes, in standard Esperanto you still use -n for a direct object even when the meaning seems obvious.

So:

• La urbo havas mil restoraciojn = correct

Without the -n, the sentence would be ungrammatical in normal Esperanto.

The -n is an important part of how Esperanto marks objects, not just something used when the sentence would otherwise be confusing.