Tutti hanno il diritto di parlare.

Here, tutti is a pronoun, not an adjective.

• Pronoun: it stands on its own and means everyone / all people
• Adjective: it would come before a noun, as in tutti gli studenti (all the students)

So in Tutti hanno il diritto di parlare, tutti is the subject of the sentence.

Because tutti is plural.

• tutto = all / whole / everything, depending on context
• tutti = all people / everyone (masculine or mixed group)

In this sentence, the idea is all people, so Italian uses the plural form tutti.

In Italian, the masculine plural is often used for a mixed group or for people in general.

So:

• tutti = all people / everyone in a general or mixed sense
• tutte = all women / an all-female group

That means Tutti hanno il diritto di parlare can refer to people in general, not just men.

Hanno is the third person plural of avere (to have) in the present tense.

Since tutti is plural, the verb must also be plural:

• tutti hanno = everyone has / all have

A quick comparison:

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

Even though English often uses everyone has with a singular-looking idea, Italian uses tutti hanno because tutti is grammatically plural.

Because the h in forms of avere is spelling only. It is not pronounced.

So hanno is pronounced as if the h were not there.

The h helps distinguish forms of avere from other words:

• anno = year
• hanno = they have

So the h is important in writing, even though it is silent.

Because Italian normally uses the article in this expression: avere il diritto di...

This is the standard pattern:

• avere il diritto di parlare
• avere il diritto di scegliere
• avere il diritto di sapere

In English, we might sometimes omit the in similar abstract expressions, but Italian often keeps the article where English may not.

Because after il diritto, when it is followed by a verb, Italian uses di + infinitive.

So:

• il diritto di parlare
• il diritto di votare
• il diritto di scegliere

A useful contrast is:

• avere il diritto di + infinitive = to have the right to do something
• avere diritto a + noun = to be entitled to something

Examples:

• Ho il diritto di parlare.
• Hai diritto a una pausa.

So in your sentence, since parlare is a verb, di is the correct choice.

Because after di, when the subject of both actions is the same, Italian usually uses the infinitive.

Here the people who have the right are also the people who speak, so Italian says:

• hanno il diritto di parlare

This is very common:

• Ho bisogno di dormire.
• Cerco di capire.
• È importante parlare.

So parlare stays in the infinitive because it depends on diritto di.

Yes, you could. It is grammatical, but it sounds a little different.

• Tutti hanno il diritto di parlare = emphasizes the group as a whole
• Ognuno ha il diritto di parlare = emphasizes each individual person

Both are correct, but they are not exactly identical in tone.

Not in this sentence, because tutti is not just a subject pronoun like loro. It carries the meaning everyone / all people.

Italian often omits subject pronouns:

• Parlano = they speak
• Hanno il diritto di parlare = they have the right to speak

But if you want to say everyone, you need tutti.

So:

• Hanno il diritto di parlare = they have the right to speak
• Tutti hanno il diritto di parlare = everyone has the right to speak

No.

• loro = they
• tutti = everyone / all of them / all people

Loro is just a personal pronoun.
Tutti adds the idea of all.

So:

• Loro hanno il diritto di parlare = they have the right to speak
• Tutti hanno il diritto di parlare = everyone has the right to speak

Yes, Italian word order is somewhat flexible, but Tutti hanno il diritto di parlare is the most neutral and natural order.

You may also see:

• Hanno tutti il diritto di parlare

This is also correct, but it can slightly shift the emphasis toward all of them.

For learners, the safest basic pattern is:

• Subject + verb + rest of sentence

So Tutti hanno il diritto di parlare is the best standard version to use.

You would change tutti to tutte:

• Tutte hanno il diritto di parlare.

The verb hanno stays the same, because it is still third person plural.

So the only change is the gender of tutti/tutte.

Not always. In this sentence, diritto is a noun: the right.

But diritto can also be an adjective meaning straight in other contexts.

Examples:

• il diritto di parlare = the right to speak
• andare diritto = to go straight

So the meaning depends on the context. Here, because of il diritto di, it is clearly the noun.

The sentence follows this structure:

• Tutti = subject
• hanno = verb
• il diritto = object/complement within the expression
• di parlare = infinitive phrase linked to diritto

So the pattern is:

[subject] + [avere] + [il diritto] + [di + infinitive]

This is a very useful pattern you can reuse:

• Tutti hanno il diritto di sapere.
• I bambini hanno il diritto di giocare.
• Abbiamo il diritto di scegliere.