A escada está molhada, então use o elevador.

A is the definite article the.

In Portuguese, it is very common to use articles where English might sometimes leave them out. So a escada means the stairs / the staircase.

Also, escada is a feminine noun, so it takes a, not o.

• a escada = the stairs / the staircase
• uma escada = a staircase / a ladder / some stairs depending on context

In Portuguese, escada is often a singular noun meaning staircase, stairway, or flight of stairs.

So even though English commonly says the stairs, Portuguese can use the singular:

• A escada está molhada. = The stairs are wet.

Portuguese can also use plural forms in some contexts, but escada in the singular is very natural when talking about the staircase as a whole.

Portuguese has two main verbs for to be: ser and estar.

Here, está is used because being wet is a temporary condition, not a permanent characteristic.

• está molhada = is wet right now
• é molhada would suggest something like is generally wet by nature, which does not fit here

So:

• A escada está molhada. = The stairs are wet at the moment.

Because adjectives usually agree with the noun in gender and number.

Escada is feminine singular, so the adjective must also be feminine singular:

• masculine singular: molhado
• feminine singular: molhada
• masculine plural: molhados
• feminine plural: molhadas

So:

• o chão molhado = the wet floor
• a escada molhada = the wet staircase

Here, então means so, therefore, or in that case.

It connects the two ideas:

• A escada está molhada = The stairs are wet
• então use o elevador = so use the elevator

It shows a consequence or result.

In speech, então can also have other uses, but in this sentence it clearly means so / therefore.

The comma separates the cause from the result:

• A escada está molhada = reason
• então use o elevador = consequence

This is very natural punctuation in Portuguese, just as in English you might write:

• The stairs are wet, so use the elevator.

It helps show the pause and the logical connection.

Use here is an imperative form, meaning it is giving an instruction: use the elevator.

Specifically, use is the command form used with você.

For the verb usar:

• você usa = you use
• use! = use! (command to você)

Compare:

• Usa o elevador. = command used with tu in many varieties
• Use o elevador. = command used with você

In Brazil, você is very common, so use is a very natural choice.

It can sound neutral, polite, or somewhat formal, depending on context.

Because it matches você, it is often the standard way to give instructions in signs, announcements, or polite directions.

For example, a building sign might naturally say:

• Use o elevador.

It is not necessarily stiff or overly formal. It is just a common instruction style in Brazilian Portuguese.

Portuguese often leaves out subject pronouns when they are understood from the verb form or the situation.

So instead of saying:

• Você use o elevador

Portuguese simply says:

• Use o elevador.

In commands, this is completely normal. The listener is understood automatically.

Portuguese often uses definite articles more frequently than English.

So o elevador means the elevator, and this sounds natural when referring to the elevator available in that place.

A sentence like use elevador would sound incomplete or unnatural in standard Portuguese.

So:

• use o elevador = use the elevator

Yes. Escada can mean stairs, staircase, or ladder, depending on context.

In this sentence, because it says use the elevator, the meaning is clearly stairs or staircase, not ladder.

Context usually makes the meaning obvious.

A closer, structure-based translation would be:

• The staircase is wet, so use the elevator.

But in everyday English, people would more often say:

• The stairs are wet, so use the elevator.

So the Portuguese structure is a little different from the most common English phrasing, even though the meaning is the same.