Si Maria ang naglalaba ng pantalon, at ako naman ang nagsasampay ng labada.

This is a very common Filipino pattern:

• Si Maria ang naglalaba ng pantalon
• literally: Maria is the one washing the pants

So the structure is not just a plain subject + verb sentence. It is more like a focus/emphasis structure:

• si Maria = the person being identified
• ang naglalaba ng pantalon = the one who is washing the pants

This pattern is very natural in Filipino and often sounds like:

• It is Maria who washes the pants
• Maria is the one washing the pants

The second half works the same way:

• ako naman ang nagsasampay ng labada
• I, on the other hand, am the one hanging the laundry

Because Filipino uses different markers for names and pronouns.

• si is used before a personal name
  • si Maria
  • si Juan
• ako is already a pronoun in the form needed here, so it does not take si

Compare:

• si Maria
• si Pedro
• ako
• ikaw
• siya

So si ako is not correct.

In this sentence, ang marks the focused/topic part of the clause.

In:

• Si Maria ang naglalaba ng pantalon

the part after ang is:

• naglalaba ng pantalon = washing pants

So the whole sentence is identifying who fits that description:

• Maria is the one who is washing the pants

Likewise:

• ako naman ang nagsasampay ng labada
• I am the one hanging the laundry

So here ang does not simply mean the. It is a grammatical marker showing the focused or topic element.

Because pantalon and labada are not the main focused nouns in these clauses.

The sentence is focused on who is doing the action:

• Maria is the one washing
• I am the one hanging

Since the verbs are in actor-focus form (naglalaba, nagsasampay), the thing being acted on is usually marked with ng.

So:

• naglalaba ng pantalon = washing pants
• nagsasampay ng labada = hanging the laundry

A helpful way to think of it:

• ang often marks the focused/topic element
• ng often marks the non-focused object or patient

Naman is a very common Filipino word with no single perfect English equivalent. In this sentence, it gives a sense like:

• on the other hand
• for my part
• meanwhile
• as for me

So:

• ako naman ang nagsasampay ng labada

means something like:

• and I, on the other hand, am the one hanging the laundry
• as for me, I’m the one hanging the laundry

It helps show a contrast or division of roles:

• Maria does one task
• I do the other task

Not exactly tense in the English sense. Filipino verbs are usually better described in terms of aspect, not strict tense.

Naglalaba is an imperfective form. It usually means the action is:

• ongoing
• repeated
• habitual
• not yet completed

So depending on context, it can mean:

• is washing
• washes
• has been washing

The same is true for nagsasampay:

• is hanging up
• hangs up

In this sentence, the most natural English translation is probably ongoing or habitual, depending on context.

It comes from the root word laba, which means wash clothes / do the laundry.

The form naglalaba has:

• nag- = a common verbal prefix
• reduplication of part of the root
• root laba

This produces an actor-focus imperfective form.

Very roughly:

• laba = wash laundry
• naglaba = washed / did laundry
• naglalaba = is washing / washes

So naglalaba ng pantalon means washing pants.

It comes from the root sampay, which means hang up to dry.

So:

• sampay = hang up
• nagsampay = hung up
• nagsasampay = is hanging up / hangs up

In laundry-related contexts, magsampay or nagsasampay usually refers to hanging clothes out to dry.

So:

• nagsasampay ng labada = is hanging the laundry up to dry

They are related, but not the same.

• laba usually refers to the act of washing clothes, or laundry in a general sense
• labada usually refers more specifically to the laundry, especially the clothes being washed or the load of laundry

In this sentence:

• naglalaba comes from laba = washing clothes
• labada refers to the laundry being hung up

So the sentence naturally uses both:

• one word for the action of washing
• another for the laundry itself

Not necessarily. Filipino nouns usually do not change form for singular vs. plural the way English nouns do.

So pantalon can mean:

• pants
• a pair of pants
• trousers

If the speaker wants to make plurality very clear, they can add a plural marker like mga in many cases, but with clothing words, context often does the job.

So ng pantalon here can naturally be understood as:

• pants
• a pair of pants

depending on the situation.

At simply means and.

So:

• Si Maria ang naglalaba ng pantalon, at ako naman ang nagsasampay ng labada.
• Maria is the one washing the pants, and I’m the one hanging the laundry.

You may hear other connectors in conversation, such as:

• at saka = and also / and then
• tapos = then / and then

But at is the most straightforward and neutral written form here.

Yes. Filipino word order is fairly flexible, though different orders can change emphasis or sound more or less natural in a given context.

For example, this sentence could also be expressed with a different emphasis pattern, but the given version strongly highlights who does each task:

• Si Maria ang naglalaba...
• ako naman ang nagsasampay...

That makes it especially good when you are contrasting roles:

• Maria does this
• I do that

So the current wording is natural because it clearly divides the work between two people.

Yes. The structure is more emphatic than a plain statement.

For example, the sentence:

• Si Maria ang naglalaba ng pantalon

sounds more like:

• Maria is the one washing the pants

rather than a flat:

• Maria washes the pants

That emphasis becomes even clearer with naman in the second clause:

• and I, in turn, am the one hanging the laundry

So the sentence is especially useful when contrasting responsibilities or answering a question like Who does what?

A very natural way to think of it is:

• Maria does the washing of the pants, and I’m the one who hangs the laundry.

Or, with the emphasis preserved a bit more closely:

• Maria is the one washing the pants, and I, on the other hand, am the one hanging the laundry.

So the Filipino sentence is not just giving information; it is also organizing that information by who is responsible for each action.