Voy al trabajo a pie.

In Spanish, the subject pronoun is often omitted because the verb ending already tells you who the subject is.

• voy = I go / I’m going
• The ending -oy clearly shows it is first person singular.

So (Yo) voy al trabajo a pie is possible, but yo is usually unnecessary unless you want emphasis or contrast:

• Yo voy al trabajo a pie, pero mi hermano va en coche.
  = I go to work on foot, but my brother goes by car.

Voy is the first-person singular present tense form of ir, which means to go.

In this sentence, voy can mean:

• I go to work on foot (habitual action)
• I’m going to work on foot (current action, depending on context)

Spanish present tense often covers both the simple present and the English present progressive when the context is clear.

Because al is the contraction of a + el.

• a = to
• el trabajo = the work / work

So:

• a el trabajo → al trabajo

This contraction is required in standard Spanish whenever a comes before el (except when el is part of a proper name).

Examples:

• Voy al mercado.
• Llegamos al aeropuerto.

Spanish often uses the definite article where English does not.

So English says:

• I go to work

But Spanish normally says:

• Voy al trabajo

Literally, that looks like I go to the work, but in natural Spanish it simply means I go to work.

This is one of those places where Spanish and English structure the idea differently.

A pie is a fixed expression meaning on foot.

So:

• Voy al trabajo a pie = I go to work on foot

It is idiomatic, so it is best learned as a whole chunk.

Compare:

• a pie = on foot
• en coche = by car
• en autobús = by bus
• en metro = by subway

Because the two a’s do different jobs:

1. Voy al trabajo
   Here, a shows destination: to work

2. a pie
   Here, a is part of the fixed expression a pie = on foot

So even though the same word appears twice, it is not repetitive in a bad way. Each a has a different function.

Yes, in many situations it can be translated that way.

• Voy al trabajo a pie literally means I go to work on foot
• In natural English, that is often just I walk to work

However, Spanish is focusing on the means of travel (on foot) rather than specifically using the verb to walk.

If you want to emphasize the act of walking itself, you could also say:

• Camino al trabajo = I walk to work

Both can work, but:

• Voy al trabajo a pie = more about how you get there
• Camino al trabajo = more directly about walking

It can be either, depending on context.

Most commonly, Voy al trabajo a pie means a routine or habit:

• I go to work on foot
• I walk to work

But in the right context, it can also mean something happening now:

• No necesito taxi; voy al trabajo a pie.
  = I don’t need a taxi; I’m going to work on foot.

Spanish present tense is flexible in this way.

Yes, that is grammatically possible, but Voy al trabajo a pie is the most neutral and common order.

Both are understandable:

• Voy al trabajo a pie
• Voy a pie al trabajo

The first version usually sounds more natural as a standard statement. The second may sound a little more marked, as if you are emphasizing a pie.

A simple approximate pronunciation is:

boy al tra-BA-ho a PYEH

A few notes:

• v in Spanish is usually pronounced very similarly to b
• j in trabajo is like a strong English h
• pie is one syllable: pye

A rough breakdown:

• voy = boy
• al = ahl
• trabajo = trah-BA-ho
• a = ah
• pie = pyeh

You technically can, because estar + gerundio expresses an action in progress:

• Estoy yendo al trabajo a pie = I am going to work on foot

But in everyday Spanish, this sounds less natural than simply saying:

• Voy al trabajo a pie

Spanish often uses the simple present where English would prefer am going. So unless you really need to stress that it is happening right now, voy is the better choice.

It is used everywhere in Spanish, including Latin America and Spain.

• Voy al trabajo is standard Spanish
• a pie is also standard everywhere

So this is a very normal, widely understood sentence in the Spanish-speaking world.