La sua presenza cambia tutto.

In Italian, possessive adjectives usually go with a definite article:

• la sua presenza
• il mio libro
• le nostre idee

So Italian normally says the equivalent of the his/her presence, even though English does not.

A major exception is with many singular family members:

• mia madre
• tuo fratello
• sua sorella

But presenza is not a family noun, so la sua presenza is the normal form.

Sua is the feminine singular form of the possessive adjective meaning:

• his
• her
• its
• sometimes your in the formal Lei form

It agrees with the thing possessed, not with the owner.

Because presenza is feminine singular, Italian uses sua.

Compare:

• la sua presenza = his/her/its/your formal presence
• il suo libro = his/her/its/your formal book
• le sue idee = his/her/its/your formal ideas

No. Sua is feminine because presenza is feminine.

This is a key difference from English: the possessive changes to match the noun being possessed, not the person who owns it.

So:

• la sua presenza — feminine singular noun
• il suo volto — masculine singular noun
• le sue parole — feminine plural noun
• i suoi gesti — masculine plural noun

Even if the owner is a man, you still say la sua presenza because presenza is feminine.

Because the subject is singular: la sua presenza.

The verb must agree with the subject:

• La sua presenza cambia tutto.
• Le sue parole cambiano tutto.

So:

• presenza = singular → cambia
• parole = plural → cambiano

Italian verbs change clearly depending on the subject, so this agreement matters.

Cambia is the third person singular present tense of cambiare.

Conjugation:

• io cambio = I change
• tu cambi = you change
• lui/lei cambia = he/she changes
• noi cambiamo = we change
• voi cambiate = you all change
• loro cambiano = they change

In this sentence, la sua presenza acts like it, so the verb is cambia.

Here tutto means everything.

When tutto is used on its own as a pronoun meaning everything, Italian normally uses tutto.

Examples:

• So tutto. = I know everything.
• Ha cambiato tutto. = He/She changed everything.
• La sua presenza cambia tutto.

You would use forms like tutta / tutti / tutte when tutto is acting as an adjective and agreeing with a noun:

• tutta la città = the whole city
• tutti i giorni = every day / all the days
• tutte le persone = all the people

Yes, it can.

Italian suo/sua/suoi/sue can also refer to the formal you (Lei). So depending on context, la sua presenza could mean:

• his presence
• her presence
• your presence (formal)
• sometimes its presence

Italian often relies on context to make this clear.

If you want to be more explicit, context or a name usually solves the ambiguity.

Mostly yes.

Presenza can refer to:

• someone physically being there
• someone’s effect or aura when they are there
• attendance or participation in some contexts

So in La sua presenza cambia tutto, it can mean literal presence or emotional/atmospheric presence.

It is a close cognate of English presence, so it is usually easy to recognize.

Yes, but the meaning becomes less specific.

• La sua presenza cambia tutto. = His/Her/Your presence changes everything.
• Cambia tutto. = It changes everything or simply Everything changes, depending on context

Italian often omits subject pronouns like it, but here the subject is a full noun phrase, so keeping la sua presenza makes the sentence clear and complete.

It is possible, but it is not the normal neutral phrasing.

The standard, natural order is:

• la sua presenza

Putting the possessive after the noun can sound more emphatic, poetic, or contrastive in some contexts:

• la presenza sua

But for everyday Italian, la sua presenza is the form learners should use.

Because the subject is already stated: la sua presenza.

Italian does not need an extra subject pronoun when the subject is a noun phrase.

So Italian says:

• La sua presenza cambia tutto.

Not:

• La sua presenza essa cambia tutto. ❌

Also, Italian often drops subject pronouns even when they are personal pronouns, because the verb ending already gives information.

Yes, but the basic sentence is the most neutral:

• La sua presenza cambia tutto.

Other orders are possible for emphasis or style, for example:

• Tutto cambia con la sua presenza. = Everything changes with his/her presence.
• Con la sua presenza, tutto cambia.

These versions are not exactly identical in rhythm or focus, but the core idea is similar.

A simple guide is:

La sua presenza cambia tutto
lah SOO-ah preh-ZEN-tsah KAHM-byah TOOT-toh

A few helpful points:

• sua is usually pronounced roughly SOO-ah
• presenza has the stress on -zen-
• cambia sounds like KAHM-byah
• tutto has a strong double tt, so hold the t a little longer than in English

A more IPA-style pronunciation is approximately:

/la ˈsu.a preˈdzɛntsa ˈkambja ˈtutto/