Seco la ropa al aire.

Here, seco is a verb: I dry.

It comes from secar = to dry.

So:

• seco la ropa = I dry the clothes / I dry the laundry
• está seco = it is dry

A quick clue is that seco is followed by la ropa, so it is acting like a verb with a direct object.

Yes. A woman still says seco here.

That is because seco in this sentence is a verb form, not an adjective. Verb endings do not change for the speaker’s gender.

So both a man and a woman say:

• Seco la ropa al aire.

But with an adjective, gender would change:

• Estoy seco if a man says I am dry
• Estoy seca if a woman says I am dry

Spanish often leaves out subject pronouns because the verb ending already tells you who the subject is.

• seco = I dry

So yo seco la ropa al aire and seco la ropa al aire both mean the same thing.

Adding yo usually gives emphasis or contrast, for example:

• Yo seco la ropa al aire, pero mi vecino usa secadora.

Because ropa is a singular collective noun in Spanish.

Even though it refers to many items, Spanish treats ropa as grammatically singular:

• la ropa
• la ropa limpia
• la ropa está mojada

So Spanish uses singular grammar where English often uses plural clothes.

In Spanish, the definite article is often used where English might not focus on the as much.

Here, la ropa means the clothes/laundry being talked about. It sounds natural and complete.

If you say just Seco ropa al aire, it sounds less natural in most normal contexts. Spanish usually wants the article here:

• Seco la ropa al aire.

Literally, al aire is to the air, but in natural English it means something like:

• in the open air
• by exposure to air
• air-dry
• sometimes outside, depending on context

So this phrase suggests drying the clothes naturally, not in a dryer.

Because a + el always contracts to al.

So:

• a + el aire → al aire

This contraction is required in normal Spanish.

Also, this shows that the noun is:

• el aire = the air

Because al aire is the idiomatic expression for being out in the open or exposed to the air.

For drying clothes, secar la ropa al aire is the normal idea of air-drying.

By contrast, en el aire often means:

• in the air
• up in the air
• on the air for TV/radio

So al aire is the better choice here.

It is the present indicative.

Depending on context, it can mean:

• I dry / I air-dry as a habit
• sometimes I am drying in a simple present-type statement

But if you want to clearly stress that the action is happening right now, Spanish often uses the progressive:

• Estoy secando la ropa al aire.

So:

• Seco la ropa al aire = general statement or habit
• Estoy secando la ropa al aire = I am air-drying the clothes right now

Yes, absolutely.

That version emphasizes the action in progress:

• Estoy secando la ropa al aire = I’m air-drying the clothes right now

The original sentence, Seco la ropa al aire, sounds more like:

• something you usually do
• a simple fact
• or a neutral statement without focusing on the ongoing process

Yes. Depending on the country and situation, you might also hear:

• Tiendo la ropa. = I hang up the laundry/clothes.
• Pongo la ropa a secar. = I put the clothes out to dry.
• La ropa se seca al aire. = The clothes dry in the air / are air-dried.
• Seco la ropa al sol. = I dry the clothes in the sun. if you specifically mean sunlight

Your original sentence is understandable and correct, but in everyday speech, people often talk about hanging the clothes rather than drying them.

A simple Latin American-style pronunciation guide is:

SEH-ko la RO-pa al AI-re

More roughly:

• seco = SEH-ko
• ropa = RO-pa
• al aire = al AI-re

Notes:

• The c in seco sounds like k because it comes before o
• aire starts with a sound like English eye
• The stress falls on SE-co, RO-pa, and AI-re