Eu amo a vida.

Yes, you often can.

Portuguese usually allows the subject pronoun to be omitted when the verb form already makes the subject clear. So both of these are natural:

• Eu amo a vida.
• Amo a vida.

Including eu adds a little emphasis, clarity, or contrast. For example:

• Eu amo a vida, mas ele reclama de tudo.
  I love life, but he complains about everything.

So eu is correct, but not always necessary.

Amo is the first-person singular form of the verb amar, which means to love.

So:

• amar = to love
• amo = I love

This verb changes depending on the subject:

• eu amo = I love
• você ama = you love
• ele/ela ama = he/she loves
• nós amamos = we love
• eles/elas amam = they love

Portuguese often uses the definite article more than English does.

So a vida literally means the life, but in Portuguese this is the normal way to express the general idea life in many contexts.

That is why Eu amo a vida sounds natural for I love life.

This happens a lot in Portuguese:

• Eu adoro a música. = I love music.
• Ele odeia o frio. = He hates cold weather / the cold.
• Ela ama a natureza. = She loves nature.

English often leaves out the article where Portuguese keeps it.

Because vida is a feminine noun.

In Portuguese, nouns have grammatical gender:

• o is the singular definite article for masculine nouns
• a is the singular definite article for feminine nouns

So:

• a vida = life
• o amor = love
• a casa = the house
• o livro = the book

Since vida is feminine, it takes a.

You usually learn the noun together with its article:

• a vida

That is the safest habit.

Also, many nouns ending in -a are feminine, and vida follows that common pattern. But this is not a perfect rule, so it is still best to memorize nouns with their articles.

For example:

• a vida
• a escola
• a porta

But there are exceptions in Portuguese, so the article is important.

It can sound strong, sincere, or expressive, but it is perfectly natural.

Just like in English, love can be used for very deep feelings or for enthusiastic statements. Eu amo a vida sounds like:

• I love life.
• I really enjoy being alive.
• I have a positive attitude toward life.

In casual conversation, Brazilians also often use adorar for things they really like:

• Eu adoro a vida.

But amo is not wrong or unnatural here.

A simple approximate pronunciation is:

eh-ooh AH-moo ah VEE-dah

A few notes:

• Eu is usually pronounced something like eh-ooh or yoo, depending on the speaker.
• amo has stress on the first syllable: A-mo
• vida has stress on the first syllable: VI-da

A more natural Brazilian flow might sound roughly like:

eu AH-mo a VEE-da

The final vowels are often lighter than an English speaker expects.

The stressed syllables are:

• Eu — the whole word is one syllable unit
• Amo — stress on A
• a — unstressed
• VIda — stress on VI

So the rhythm is roughly:

EU A-mo a VI-da

In normal speech, eu and the article a are weaker, while amo and vida carry more of the sentence rhythm.

Yes.

Vida can mean:

• life in general
• a life
• someone’s life
• way of life in some contexts

Examples:

• A vida é bela. = Life is beautiful.
• A vida dele mudou. = His life changed.
• Ela salvou uma vida. = She saved a life.

In Eu amo a vida, it usually means life in general.

Yes, but it means something a bit softer.

• Eu amo a vida. = I love life.
• Eu gosto da vida. = I like life.

Notice that gostar works differently from amar:

• amar algo = to love something
• gostar de algo = to like something

So with gostar, you need de:

• Eu gosto da vida.

This is actually de + a vida = da vida.

Because amar is a direct transitive verb. That means it takes a direct object without a preposition.

So:

• amar a vida
• amar a família
• amar música

But some other verbs do require a preposition. For example:

• gostar de = to like
• precisar de = to need

Compare:

• Eu amo a vida.
• Eu gosto da vida.

So the a in a vida is just the article, not a preposition.

In this sentence, a is an article, not a preposition.

You can tell because it goes directly with the noun vida and matches its gender:

• a vida

If it were a preposition, it would have a different grammatical role. Here, amo takes a direct object, so no preposition is needed.

The normal word order is:

• Eu amo a vida.

You can change the order for emphasis, but it becomes more marked or poetic:

• A vida eu amo.

That sounds like Life, I love or It’s life that I love, with special emphasis. It is not the most neutral everyday order.

So for standard use, stick with:

• Eu amo a vida.

Both are natural, but dropping it is very common:

• Amo a vida.

Brazilian Portuguese does use subject pronouns more often than some other varieties of Portuguese, but omission is still very common when the meaning is obvious.

A speaker might include eu to:

• emphasize the subject
• create contrast
• make the sentence clearer
• sound a bit more explicit

So Eu amo a vida and Amo a vida are both good.

Usually, no—not by itself.

Eu amo a vida normally means I love life in a general sense.

If you want to say I love my life, you would usually say:

• Eu amo a minha vida.

In Portuguese, adding minha makes it specifically my life.

Compare:

• Eu amo a vida. = I love life.
• Eu amo a minha vida. = I love my life.

It is neutral.

There is nothing especially formal or informal about:

• Eu amo a vida.

It can work in conversation, writing, social media, song lyrics, or everyday speech. The tone mainly depends on context and intonation.

For example, it could sound:

• heartfelt
• cheerful
• philosophical
• dramatic

But grammatically, it is neutral and standard.