Nasa banyo ang sabon at sipilyo ni Pedro.

Nasa means something like is/are in, at, on depending on context. In this sentence, Nasa banyo means is/are in the bathroom.

A helpful thing to know is that nasa historically comes from na sa, but learners usually just treat nasa as a single word meaning located in/at/on.

Filipino often does not need a separate present-tense copula like English is/are in sentences like this.

So instead of saying something structurally like The soap and toothbrush are in the bathroom, Filipino can say:

Nasa banyo ang sabon at sipilyo ni Pedro.

Literally, the structure is closer to:

In the bathroom the soap and toothbrush of Pedro.

The meaning is still perfectly natural.

Because predicate-first word order is very common in Filipino.

Here:

• Nasa banyo = the predicate/comment
• ang sabon at sipilyo ni Pedro = the topic being talked about

So the sentence is built as:

Predicate + topic

You can also say:

Ang sabon at sipilyo ni Pedro ay nasa banyo.

That means the same thing, but the version with nasa banyo first is very natural and common.

Not exactly. Ang is best thought of as a topic marker, not simply the English article the.

In this sentence, ang marks sabon at sipilyo ni Pedro as the main noun phrase being talked about.

Sometimes ang corresponds to the in translation, but not always. It is a grammatical marker, not a direct one-word equivalent of the.

Because the sentence names the two items separately:

• sabon = soap
• sipilyo = brush/toothbrush

When Filipino lists nouns with at (and), the plurality is already clear. You do not need mga here.

Mga is more useful when one plural noun is being marked as plural, such as:

• ang mga sabon = the soaps

But sabon at sipilyo already clearly refers to more than one item.

Yes. Ni Pedro is the genitive form used with a personal name, so it means Pedro's or of Pedro.

So:

• ang sabon at sipilyo ni Pedro = Pedro's soap and toothbrush

This is one of the most common ways to show possession with a named person in Filipino.

The most natural reading is that it applies to both:

• Pedro's soap and toothbrush

Because ni Pedro comes after the whole coordinated phrase sabón at sipilyo, it usually describes the whole set.

If you wanted to make it clearer that only the second noun belongs to Pedro, you would usually rephrase it, for example by repeating a marker:

• Nasa banyo ang sabon at ang sipilyo ni Pedro.

That more strongly suggests the soap and Pedro's toothbrush rather than both being Pedro's.

Because ni is the normal marker for possession with a personal name inside a noun phrase.

So:

• ang sabon ni Pedro = Pedro's soap

By contrast, kay is used in other roles, often like to, for, at, from, or in a different possession pattern:

• Kay Pedro ang sabon. = The soap belongs to Pedro.

So in your sentence, where Pedro is the possessor inside the noun phrase, ni Pedro is the correct choice.

Not always. Sipilyo literally means brush.

But in bathroom context, especially next to sabón, many learners and speakers will naturally understand it as toothbrush.

If you want to be more explicit, you can say something like:

• sipilyo sa ngipin = toothbrush

Still, in everyday speech, sipilyo alone is often enough when the context makes it obvious.

You look at the noun phrase, not at nasa itself.

Nasa does not change for singular or plural. So:

• Nasa banyo ang sabon. = The soap is in the bathroom.
• Nasa banyo ang sabon at sipilyo ni Pedro. = Pedro's soap and toothbrush are in the bathroom.

English has to choose is or are, but Filipino does not.

Yes. That is a correct and natural alternative.

Compare:

• Nasa banyo ang sabon at sipilyo ni Pedro.
• Ang sabon at sipilyo ni Pedro ay nasa banyo.

They mean the same thing. The first is the common predicate-first pattern. The second uses ay to put the topic first. That version can sound a bit more formal, careful, or explanatory.

Sa banyo is simply a location phrase: in the bathroom.

Nasa banyo can function as a full predicate meaning is/are in the bathroom.

So:

• sa banyo = in the bathroom
• nasa banyo = is/are in the bathroom

That is why your sentence uses nasa, not just sa.

You would say:

Nasa banyo si Pedro.

This is useful for comparison:

• Nasa banyo ang sabon at sipilyo ni Pedro.
• Nasa banyo si Pedro.

Here you can see that ang is used with the common-noun phrase, while si is the corresponding marker for a personal name as the topic.

It is a borrowed word, ultimately from Spanish baño. Filipino has many common everyday words borrowed from Spanish, and banyo is one of them.

For learners, the important thing is simply that banyo means bathroom and is very common in everyday speech.