O campo está verde.

In Portuguese, it is very common to use the definite article with nouns when talking about a specific thing: o campo = the field.

You can sometimes say just campo, but that usually sounds more general or appears in fixed expressions. In this sentence, o campo refers to a particular field, so o is natural.

Also, campo is a masculine singular noun, so it takes o.

This is one of the most important points in Portuguese: ser and estar both mean to be, but they are used differently.

Here, está verde suggests a current state or condition:

• the field is green right now
• it looks green, perhaps because the grass is growing well

If you said O campo é verde, it would sound more like green is an inherent or defining characteristic, which is less natural in this context.

So:

• ser = more permanent / defining
• estar = more temporary / current condition

Está is the 3rd person singular form of estar in the present tense.

Full present tense of estar:

• eu estou
• você / ele / ela está
• nós estamos
• vocês / eles / elas estão

In O campo está verde, the subject is o campo, which is third person singular, so está is the correct form.

The accent in está shows the stressed syllable and is part of the correct spelling.

Without getting too technical, it helps mark the pronunciation:

• es-TÁ

This is different from some other forms of the verb, such as:

• estamos
• estava
• estar

So yes, the accent is required.

Because verde is functioning as an adjective that describes the subject after the verb estar.

The structure is:

• subject + estar + adjective

So:

• O campo está verde
• A casa está limpa
• O céu está azul

This is similar to English The field is green.

Verde is an adjective, and adjectives in Portuguese usually agree with the noun in gender and number.

However, some adjectives have the same form for masculine and feminine singular. Verde is one of them.

So:

• o campo verde
• a grama verde

Both use verde in the singular.

But it does change in the plural:

• os campos estão verdes
• as plantas estão verdes

So verde stays the same in singular, but becomes verdes in plural.

A rough Brazilian Portuguese pronunciation is:

o KAHM-po es-TA VER-jee
or in some accents closer to
u KAHM-pu is-TA VER-dji

A few notes:

• o often sounds like u in normal Brazilian speech
• campo has nasalization because of the am
• está is stressed on the last syllable
• d before e in many Brazilian accents sounds like dj, so verde may sound like VER-djee

A careful learner pronunciation could be: oh KAHM-po es-TAH VEHR-deh

That is fine as a starting point.

No. Campo has several meanings depending on context. It can mean:

• field (a grassy or open area)
• countryside
• soccer field / pitch
• area / field of study in some contexts

In this sentence, it most naturally means a physical field or open area of land.

In this sentence, verde is most naturally understood as the color green.

It is true that verde can have other meanings in some contexts, such as:

• unripe fruit
• someone inexperienced or naive

But with campo, the normal meaning is simply that the field is green.

Yes. In spoken Brazilian Portuguese, tá is a very common informal short form of está.

So:

• O campo está verde = standard / neutral
• O campo tá verde = informal, very common in speech

Both are correct in the right context. For writing exercises and formal learning, it is better to start with está.

The plural would be:

Os campos estão verdes.
= The fields are green.

Notice all the changes:

• o → os
• campo → campos
• está → estão
• verde → verdes

This is a good example of agreement in Portuguese.

It is possible in literary or poetic language, but it is not the normal choice here.

Normal, natural wording:

• O campo está verde
• O campo verde = the green field

O verde campo sounds poetic, elevated, or stylistic.

For everyday Portuguese, stick with:

• o campo verde when the adjective directly describes the noun
• o campo está verde when using the verb estar

It can be both at the same time.

Literally, it says the field is green, so it definitely refers to color. But because it uses estar, it often also suggests a current condition:

• the field is looking healthy
• the grass has grown
• the land is not dry right now

So the sentence often carries the idea of both appearance and current state.