Kung wala kang susi, nasa akin ang pitaka mo.

Kung introduces a condition. In English, it is usually if.

So Kung wala kang susi means If you don't have a key / If you have no key.

In other contexts, kung can also feel like when, but if is the safest basic meaning here.

Wala means there is none, there is no, or not have, depending on context.

In Filipino, wala is often used to express nonexistence or lack:

• May susi ako. = I have a key.
• Wala akong susi. = I don't have a key.

So in wala kang susi, wala is showing that the person has no key.

Kang is ka + the linker -ng.

• ka = you (singular)
• -ng links that word to what follows

So:

• wala ka = you are without / you don't have
• wala kang susi = you don't have a key

This -ng is not the same thing as the separate marker ng used elsewhere in Filipino.

A very common learner confusion is mixing this up with ka nang. For example:

• wala kang susi = you don't have a key
• wala ka nang susi = you no longer have a key

Those are different.

Because wala is the normal way to express not having or absence.

Filipino does not usually negate may that way. Instead of saying something like not you have a key, Filipino normally uses:

• may/meron for existence or possession
• wala for nonexistence or lack

So the natural pair is:

• May susi ka. = You have a key.
• Wala kang susi. = You don't have a key.

Most directly, it means you don't have a key or you have no key.

It does not automatically mean a specific key is missing. If you want to talk about your specific key being missing, Filipino would usually make that clearer, for example:

• Wala ang susi mo. = Your key isn't there.
• Nawawala ang susi mo. = Your key is lost / missing.

So wala kang susi is more about lack of possession, not necessarily about a specific missing object.

Nasa akin means is with me, is on me, or is in my possession, depending on context.

With an object like pitaka (wallet), nasa akin usually means that the object is physically with the speaker.

So:

• Nasa akin ang pitaka mo. = Your wallet is with me.

You can think of nasa as introducing a location or place/state, and akin as the form meaning me after that kind of expression.

Because Filipino pronouns change form depending on their role in the sentence.

For I / me / my, the common forms are:

• ako = I / me
• ko = my / by me
• akin = mine / to me / for me / with me after sa, nasa, etc.

So after sa or nasa, you use the akin form:

• sa akin = to me / for me / with me
• nasa akin = with me / in my possession

That is why nasa ako and nasa ko would be wrong here.

Because in Filipino, possessive pronouns usually come after the noun they modify.

Examples:

• bahay ko = my house
• kotse niya = his/her car
• pitaka mo = your wallet

So pitaka mo is the normal word order, not mo pitaka.

This is one of the big structural differences from English.

Ang marks the topic or the main noun phrase of the clause.

In Nasa akin ang pitaka mo, the thing being located is ang pitaka mo. The location is nasa akin.

A useful way to see the structure is:

• nasa akin = with me
• ang pitaka mo = your wallet

So the sentence is built like With me is your wallet, which in natural English becomes Your wallet is with me.

Because Filipino often leaves out the verb to be in this kind of sentence.

In many nonverbal sentences, Filipino does not need a separate word corresponding to English is / are / am.

So:

• Nasa akin ang pitaka mo. literally works without any extra is
• natural English: Your wallet is with me

If you want a more formal or marked version, Filipino can use ay in some sentence patterns:

• Ang pitaka mo ay nasa akin.

But ay is not the same as English is. It is more of a structural marker.

Because Filipino often prefers predicate-first word order.

So the neutral pattern is often:

• Predicate + ang-phrase

Here:

• nasa akin = predicate
• ang pitaka mo = topic/main noun phrase

That gives:

• Nasa akin ang pitaka mo.

You can also say:

• Ang pitaka mo ay nasa akin.

That version is also correct, but it has a different feel: a little more formal, deliberate, or emphatic.

Usually, nasa akin is clearer and more natural here if you mean your wallet is with me.

Sa akin by itself can have several meanings depending on context, such as:

• to me
• for me
• with me
• from my point of view

Because of that, nasa akin more clearly expresses location or possession-in-hand.

So for this sentence, Nasa akin ang pitaka mo is the better choice.

The comma separates the conditional clause from the main clause.

• Kung wala kang susi = conditional part
• nasa akin ang pitaka mo = main statement

So the comma works much like in English:

• If you don't have a key, your wallet is with me.

It helps the sentence read more clearly, especially because the first part is setting up a condition.