O terreno está molhado?

Because estar is used for a state or condition, and molhado describes a temporary condition: the land is wet right now.

• O terreno está molhado. = The ground/lot is wet.
• É would usually be used for something more permanent or defining.

So in this sentence, está molhado is the natural choice because wetness is not an essential characteristic of the land.

Terreno usually means a piece of land, plot, lot, or ground area. Depending on context, it can refer to:

• an empty lot
• a piece of property
• a patch of land
• ground in a general sense

So it is not always exactly the same as English terrain. In many everyday situations, terreno is closer to plot of land or lot.

O is the masculine singular definite article, meaning the.

• o terreno = the lot / the land / the ground area

Portuguese uses definite articles more often than English does, so including o is very normal here. In English, you might sometimes just say Is the ground wet?, but in Portuguese the article often sounds more natural.

Usually, no. That sounds incomplete or unnatural in standard Portuguese.

In normal speech, you would typically say:

• O terreno está molhado?

Dropping the article is only possible in special contexts, such as note-taking, headlines, or very unusual speech situations. For a learner, it is best to keep o here.

Because molhado agrees in gender and number with terreno, which is masculine singular.

Agreement patterns:

• o terreno está molhado = masculine singular
• a terra está molhada = feminine singular
• os terrenos estão molhados = masculine plural
• as áreas estão molhadas = feminine plural

So molhado changes form to match the noun it refers to.

In Portuguese, yes/no questions are often formed without changing the word order. The sentence becomes a question mainly through:

• intonation in speech
• the question mark in writing

So:

• O terreno está molhado. = The lot is wet.
• O terreno está molhado? = Is the lot wet?

This is very common in Portuguese.

A natural Brazilian pronunciation is approximately:

oo teh-HEH-noh es-TAH mo-LYAH-doh?

A more IPA-style version is roughly:

/u teˈʁenu isˈta moˈʎadu/

A few helpful notes:

• rr in terreno is a throat/back-of-the-mouth sound in Brazilian Portuguese.
• lh in molhado sounds like the lli in million for many English speakers.
• In natural speech, está may sound a bit like istá.

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

So you will often hear:

• O terreno tá molhado?

This is very natural in conversation.
Use está in more careful, formal, or written language; use tá freely in casual speech.

Not exactly.

• molhado = wet, usually clearly wet, as if water is on it
• úmido = damp, moist, or humid, often less intensely wet

So:

• O terreno está molhado suggests the land is actually wet.
• O terreno está úmido suggests it is damp or moist, maybe after light rain or because of humidity.

Both are possible, but they are not perfect synonyms.

Sometimes, yes, but the meaning shifts a bit.

• chão usually means floor or ground surface
• terreno usually means a plot/piece of land

Examples:

• O chão está molhado. = The floor/ground is wet.
• O terreno está molhado. = The lot/piece of land is wet.

If you are talking about a property, yard area, or empty lot, terreno is often better. If you mean the surface under your feet, chão may be more natural.

Because molhado is not directly modifying the noun inside the noun phrase here. It is part of the predicate with estar:

• O terreno = the subject
• está molhado = is wet

This structure is very common:

• A porta está aberta. = The door is open.
• A rua está vazia. = The street is empty.

If you put the adjective directly with the noun, the meaning or style can change:

• o terreno molhado = the wet lot / the wet piece of land

But in your sentence, the speaker is making a full statement/question about the condition of the land, so está molhado is the natural structure.