La guerra cambia molte vite.

In Italian, a general or abstract noun often takes the definite article. So la guerra can mean war in a general sense, not only the war in one specific historical situation.

This is different from English, where we often say just war with no article.

So:

• La guerra cambia molte vite. = War changes many lives.

Italian very often uses the article where English does not.

Cambia is the third-person singular present tense of cambiare (to change).

Here the subject is la guerra, which is singular, so the verb must also be singular:

• la guerra cambia = war changes

A quick comparison:

• io cambio = I change
• tu cambi = you change
• lui/lei cambia = he/she changes
• la guerra cambia = war changes

Because vite is a feminine plural noun.

• singular: vita = life
• plural: vite = lives

The adjective or quantifier must agree with the noun:

• molta vita = much life
• molte vite = many lives

Molti is the masculine plural form, so it would be wrong here.

Agreement pattern:

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

Because vita is a regular feminine noun ending in -a, and most nouns of this type form the plural in -e:

• vita → vite
• casa → case
• strada → strade

So vite is the normal plural form of vita.

Because molte already gives the noun an indefinite quantity: many lives.

In Italian, when you use words like molti / molte, you usually do not need an article before the noun in a sentence like this.

So:

• molte vite = many lives

If you added an article, it would change the structure and meaning.

It is the normal, neutral order in Italian:

subject + verb + object

• La guerra = subject
• cambia = verb
• molte vite = object

So this sentence is very straightforward and natural.

You can change word order in Italian for emphasis, but the basic version is:

• La guerra cambia molte vite.

Yes. Tante vite also means many lives, and it sounds very natural.

Difference in tone:

• molte vite = many lives
• tante vite = many / so many lives

Tante can sometimes feel a little more expressive or emotional, depending on context. But both are correct.

Because Italian usually does not use subject pronouns unless they are needed for emphasis or clarity.

Here, the subject is already clearly stated:

• La guerra cambia molte vite.

So adding essa would be unnecessary and unnatural in most contexts.

Italian normally prefers:

• La guerra cambia...

not:

• Essa cambia... unless there is a special reason to emphasize the subject.

The article tells you:

• la guerra

Also, nouns ending in -a are often feminine, though not always.

Because guerra is feminine singular:

• it takes la
• if you used an adjective with it, that adjective would also be feminine singular

For example:

• la guerra lunga = the long war

Yes. In Italian, cambiare can be used both intransitively and transitively, depending on context.

Here it is transitive, because it has a direct object:

• La guerra cambia molte vite.
• war changes many lives

Examples:

• Il tempo cambia. = The weather changes.
• Il tempo cambia i piani. = The weather changes the plans.

So in your sentence, cambia means changes in the sense of affects/transforms.

Guerra is pronounced roughly like GWEHR-ra.

A few useful points:

• gu before e here sounds like gw
• the rr is rolled or tapped in Italian
• stress is on the first syllable: GUER-ra

And cambia is roughly KAHM-bya, with the stress on cam.

So the full sentence sounds approximately like:

• la GWEHR-ra KAHM-bya MOL-te VEE-te

These are only approximations, but they can help you get started.