Hindi lang komportable ang sapatos na ito, kundi kasya rin nang maayos sa akin.

This is a very common Filipino pattern meaning not only ..., but also ....

In this sentence:

• Hindi lang komportable ... = not only comfortable ...
• kundi kasya rin ... = but also fits ...

A few notes:

• lang means only / just
• kundi is used here as but rather / but also
• rin means also

So the structure is working as a pair:

• Hindi lang X, kundi Y rin
• Not only X, but Y also

A more formal version is Hindi lamang ..., kundi ... rin.
Lang and lamang mean the same thing here.

Because Filipino often puts the predicate first.

So instead of starting with the subject like English often does, Filipino commonly starts with what is being said about the subject.

Here:

• Komportable = the predicate
• ang sapatos na ito = the topic/subject-like part

So the structure is roughly:

• Komportable ang sapatos na ito
• The shoes are comfortable

This predicate-first order is very normal in Filipino.

Ang marks the topic of the sentence. In many basic sentences, this is the noun phrase that is most like the English subject.

So in:

• ang sapatos na ito

the whole phrase means these shoes / this pair of shoes, and ang marks it as the main thing being talked about.

A useful way to think about it:

• komportable = what is being said
• ang sapatos na ito = what it is being said about

Because na is a linker.

In Filipino, when one word modifies another, a linker is often used to connect them smoothly.

Here:

• sapatos = shoes
• ito = this
• sapatos na ito = these shoes / this pair of shoes

So na links the noun sapatos to the demonstrative ito.

This is a very common pattern:

• bahay na ito = this house
• taong iyon = that person

Kasya means to fit.

In this sentence, it refers to size or physical fit, not emotional comfort.

So:

• komportable = comfortable
• kasya = fits

That is why both words are used: they describe two different good things about the shoes.

Examples:

• Kasya ang damit sa akin. = The clothes fit me.
• Hindi kasya ang sapatos. = The shoes do not fit.

Because kasya normally goes with sa when talking about the person something fits.

So the pattern is:

• kasya sa akin = fits me
• kasya sa iyo = fits you
• kasya sa kanya = fits him/her

You do not usually say kasya ako for this meaning.

This is similar to how some verbs and adjectives in Filipino require a specific marker or preposition-like word.

Rin means also.

Filipino has two forms:

• din
• rin

They mean the same thing. The choice depends mostly on the sound before them.

A common rule:

• use rin after words ending in a vowel, w, or y
• use din after most other consonants

Here the word before it is kundi, which ends in the vowel i, so rin is the natural choice:

• kundi kasya rin

Nang maayos means properly, well, or in a good way.

It describes how the shoes fit.

So:

• kasya rin nang maayos sa akin = also fit me properly / fit me well

Here, maayos means proper, neat, good, or well-arranged, depending on context.

With nang, it becomes an adverbial phrase describing the manner of the action or state.

Because nang is used here to mark an adverbial idea: in a proper way / properly.

A helpful quick distinction is:

• ng often marks an object or possession
• nang often marks manner, time, or functions like so that / when / in a ... way

In nang maayos, the phrase describes how the shoes fit, so nang is appropriate.

That said, in everyday writing, many native speakers mix up ng and nang, so you may sometimes see variation. But in careful grammar, nang maayos is the better form here.

It is a borrowed word, ultimately from English comfortable.

This is very common in Filipino. Many everyday words are borrowed and adapted to Filipino spelling or pronunciation.

So komportable functions naturally as a Filipino adjective.

You will often see borrowed adjectives used just like native ones:

• praktikal
• normal
• komportable

Yes.

• Hindi lang komportable ...
• Hindi lamang komportable ...

Both are correct and mean the same thing.

The difference is mostly style:

• lang = shorter, more conversational
• lamang = slightly more formal or careful

In everyday speech, lang is extremely common.

Sapatos usually refers to shoes as a general item or a pair, depending on context.

In this sentence, because the idea is about wearing them and whether they fit, it is naturally understood as the shoes or this pair of shoes.

Filipino nouns do not always mark singular and plural in the same way English does, so context often tells you what is meant.

Yes, to some extent. Filipino word order is flexible, though some versions sound more natural than others.

The given sentence is very natural:

• Hindi lang komportable ang sapatos na ito, kundi kasya rin nang maayos sa akin.

You might also hear something like:

• Hindi lang komportable ang sapatos na ito, kundi kasya rin sa akin nang maayos.

Both are understandable. The original sounds smooth and natural.

What matters most is keeping the correlative pattern clear:

• Hindi lang X, kundi Y rin

That is the core structure of the sentence.