Pagdating namin sa bahay, hinubad ko ang dyaket ko at pinalitan ang basa kong medyas.

Literally, it means upon our arrival at the house/home.

In natural English, that usually becomes:

• When we arrived home
• When we got home

Here, pagdating is a noun-like form from dating/dating in the sense of arrival. So instead of a full clause like when we arrived, Filipino can use this compact structure:

• Pagdating namin sa bahay = upon our arriving at home

It is a very common way to introduce a time clause.

Because pagdating behaves like a noun-like form here, and Filipino uses the genitive pronoun after it.

So:

• namin = our
• kami = we

You can think of it this way:

• Pagdating namin = our arrival
• Dumating kami = we arrived

So kami would be used with a full verb, but namin is used with pagdating.

Because the sentence is talking about two different doers:

• Pagdating namin sa bahay = when we arrived home → we
• hinubad ko... at pinalitan... = I took off... and changed... → I

So the group arrived home together, but the later actions were done by the speaker alone.

It can suggest either to the house or at home, depending on context, but in this sentence the natural English meaning is home or at the house.

• sa is a general location/direction marker
• bahay = house/home

So:

• sa bahay can mean to the house, at the house, or simply home, depending on the sentence

In Pagdating namin sa bahay, the best translation is usually when we got home.

Hinubad ko means I took off.

The base word is hubad, which in this context is used for removing clothes or something worn.

So:

• hubad = take off / remove clothing
• hinubad = took off

The -in- infix shows completed aspect here, so hinubad refers to a finished action.

Because ang dyaket ko is the thing being acted on.

In this sentence:

• hinubad ko = I took off
• ang dyaket ko = my jacket

With this verb form, Filipino marks the thing affected by the action with ang.

So the pattern is roughly:

• hinubad ko ang dyaket ko
• I took off my jacket

Here:

• ko marks the doer
• ang marks the thing taken off

Because possessors like ko usually come after the noun in Filipino.

So:

• dyaket ko = my jacket
• bahay namin = our house
• medyas ko = my socks

This is the normal pattern:

• noun + possessive pronoun

Pinalitan comes from palit, meaning change or replace.

In this sentence, pinalitan ang basa kong medyas means:

• changed my wet socks
• more literally, replaced my wet socks

Filipino often leaves the replacement item unstated if it is obvious from context. So the sentence does not explicitly say with dry socks, but that idea is naturally understood.

Because the subject is already clear from the earlier verb.

The sentence says:

• hinubad ko ang dyaket ko at pinalitan ang basa kong medyas

After hinubad ko, it is already understood that the same person is still doing the next action, so Filipino can omit the repeated ko.

You could also say:

• hinubad ko ang dyaket ko at pinalitan ko ang basa kong medyas

That is also correct, but the version without the second ko sounds natural and less repetitive.

Basa kong medyas means my wet socks.

The parts are:

• basa = wet
• ko = my
• -ng = linker
• medyas = socks

So kong is really ko + -ng.

The linker is needed to connect the phrase smoothly to the noun that follows. This pattern is very common:

• bago kong sapatos = my new shoes
• maliit kong bag = my small bag
• basa kong medyas = my wet socks

Both ideas are possible, but they are structured a little differently.

• basa kong medyas = my wet socks
• medyas kong basa = my socks that are wet

The sentence uses basa kong medyas, which puts the adjective first. That is a very natural way to say it.

What you cannot do is leave out the linker, so basa ko medyas would be incorrect.

In everyday Filipino, medyas can refer to socks in a general sense, often understood as the pair someone is wearing.

Unlike English, Filipino nouns do not always show singular/plural clearly unless needed. If you want to make the plural very explicit, you can add mga:

• mga medyas = socks

But in this sentence, medyas naturally means the socks the speaker was wearing.

Yes. Both can mean when we arrived home.

Compare:

• Pagdating namin sa bahay...
• Nang dumating kami sa bahay...

The version with pagdating is a compact, very natural way to introduce the time background for what happened next. The version with nang dumating kami is a fuller clause.

So they are close in meaning, but pagdating namin... often sounds a bit more streamlined.