Kapag nasa bahay na tayo, ilagay mo ang saging at mansanas sa istante kung wala nang lugar sa ref.

They are related, but they do different jobs here.

• kapag usually means when / whenever / once, especially for a future or repeated situation.
• kung usually means if.

So in this sentence:

• Kapag nasa bahay na tayo = When/once we’re already home
• kung wala nang lugar sa ref = if there’s no more space in the fridge

A natural way to feel the difference is:

• kapag sets the time or circumstance
• kung gives the condition

It literally means something like we are already at home / in the house.

Breakdown:

• nasa bahay = at home / in the house
• na = already
• tayo = we (including the person being spoken to)

So nasa bahay na tayo is we’re already home or once we’re home already, depending on context.

Also, Filipino often puts the predicate first, so having tayo later in the clause is normal.

In modern everyday Filipino, nasa is normally written as one word when it means is/are at, in, on somewhere.

So:

• nasa bahay = at home
• nasa mesa = on the table
• nasa ref = in the fridge

That means the na in nasa is not the same as the separate na later in nasa bahay na tayo.

In this sentence:

• nasa = location marker
• the separate na = already

So yes, there are two forms that look similar, but they are doing different things.

Because tayo is the inclusive form of we.

Filipino distinguishes between:

• tayo = we, including you
• kami = we, excluding you

Since the speaker is clearly including the listener in when we’re home, tayo is the correct choice.

This is about focus.

• ilagay is an object-focus form: it highlights the thing being put somewhere.
• maglagay is an actor-focus form: it highlights the doer of the action.

Here the sentence is specifically about the bananas and apples being placed somewhere:

• Ilagay mo ang saging at mansanas sa istante
  = Put the bananas and apples on the shelf

That is why the sentence uses ilagay.

If you used maglagay, the structure would normally change too, for example:

• Maglagay ka ng saging at mansanas sa istante

That sounds more like Put some bananas and apples on the shelf, with less emphasis on those items as the main target of the action.

Because short pronouns like mo, ko, niya, natin, kayo often behave like enclitics in Filipino. That means they usually come after the first element of the clause, especially after the verb in commands.

So:

• Ilagay mo = You put it / Put it
• Sabihin mo = You say / Tell
• Kunin mo = Get it

This is normal word order for an imperative.

Because ang marks the noun phrase that is in focus in this sentence structure.

With ilagay, the thing being placed is marked with ang:

• ilagay mo ang saging at mansanas
  = put the bananas and apples

So ang saging at mansanas is the thing being acted on.

Also, only one ang is needed because it marks the whole coordinated phrase:

• ang saging at mansanas = the banana(s) and apple(s)

You could repeat it for emphasis:

• ang saging at ang mansanas

but that is not necessary here.

Because Filipino often leaves number unmarked unless it needs to be explicit.

A bare noun like saging or mansanas can sometimes be understood from context as:

• a general item
• one item
• several items

So ang saging at mansanas can work in context if the speaker and listener already know which fruit is being talked about.

If you want to make the plural more explicit, you could say:

• ang mga saging at mga mansanas

But everyday Filipino often relies on context instead of marking plurals every time.

sa is a very broad location marker in Filipino. Depending on context, it can correspond to English:

• in
• on
• at
• sometimes even to

So:

• sa istante = on the shelf
• sa ref = in the fridge

English makes a sharper distinction between in/on/at than Filipino does. Filipino often uses sa for all of them, and the exact English translation comes from context.

Wala nang lugar means there is no more space or there’s no room left.

Breakdown:

• wala = there is none / there isn’t
• na = already / anymore / no longer
• -ng = linker connecting to the next word
• lugar = space / room / place

So:

• wala na + -ng lugar → wala nang lugar

Here, nang is basically the result of na plus the linker -ng. It does not have the usual separate adverb meaning that learners sometimes associate with nang.

A good way to understand the whole phrase is just:

• wala nang lugar = no more space

Because Filipino often puts time or condition information first, especially in natural speech.

So this order:

• Kapag nasa bahay na tayo, ilagay mo...

feels very natural because it sets up the situation first: Once we’re home...

You can change the order:

• Ilagay mo ang saging at mansanas sa istante kapag nasa bahay na tayo kung wala nang lugar sa ref.

But the original sounds smoother and easier to process.

In other words, the sentence starts with the when part before giving the instruction.

Yes. Ref is a very common everyday Filipino word, borrowed from English refrigerator.

It is informal but completely natural in conversation. Many speakers use it more often than a full formal term.

You may also hear:

• refrigerator
• pridyeder / pridyider in some varieties

But ref is extremely common and sounds normal here.

Yes, often you can.

• kapag is the fuller form
• pag is a very common shortened conversational form

So:

• Kapag nasa bahay na tayo...
• Pag nasa bahay na tayo...

Both are natural. The full kapag may sound a bit more careful or complete, while pag is very common in everyday speech.

at means and.

So:

• saging at mansanas = bananas and apples / banana(s) and apple(s)

It is the standard written Filipino word for and. In casual spoken Filipino, especially in mixed Filipino-English speech, people may also use tsaka or even and, but at is the standard form here.