Lima ang sako.

Because Filipino often puts the predicate first. In Lima ang sako, lima is the predicate, and ang sako is the topic.

A very literal breakdown is:

• lima = five
• ang sako = the sack / the sacks, marked as the topic

So the structure is closer to Five are the sacks than to normal English word order. This is a very common pattern in Filipino.

Ang is a marker for the topic of the sentence. It does not work exactly like English the, even though it is sometimes translated that way.

In Lima ang sako, ang sako is the thing being talked about or identified as having the quantity five.

So ang is not the verb and not a number marker. It simply marks sako as the main noun phrase of the sentence.

Filipino often leaves out the verb to be in sentences like this. This is normal.

So instead of saying something like The sacks are five, Filipino can simply say:

• Lima ang sako.

This is called a nonverbal sentence. The predicate is not a verb here; it is a number.

Because lima is not directly modifying sako here.

When a number directly modifies a noun, Filipino usually uses a linker:

• limang sako = five sacks

But in Lima ang sako, the structure is different:

• lima = predicate
• ang sako = topic

Since lima is not directly attached to sako, there is no linker, so it stays lima, not limang.

Because the number already makes the plural meaning clear.

In Filipino, nouns do not always need a separate plural marker when a number is present. If you say lima, everyone already knows you mean more than one.

So:

• limang sako = five sacks
• Lima ang sako = the sacks are five / there are five sacks

In both cases, mga is usually unnecessary.

By itself, sako can be understood as singular or plural depending on context. Filipino nouns are often not marked for number as strictly as English nouns are.

But in Lima ang sako, the presence of lima tells you that the meaning is plural.

So even though the noun appears as sako, the whole sentence clearly refers to five sacks.

Yes, but it is most natural in a context where you are stating or answering the quantity.

For example, it works well as an answer to a question like:

• Ilan ang sako? = How many sacks are there?

Answer:

• Lima ang sako.

If you simply want to say There are five sacks in a more neutral way, many speakers would often say:

• May limang sako.

So Lima ang sako is natural, but it can sound a bit more like The number of sacks is five or There are five sacks with focus on the count.

Yes, that is grammatical.

• Lima ang sako
• Ang sako ay lima

Both can express the same basic idea. The version with ay is an inverted form and can sound more formal, more careful, or more literary.

In everyday speech, Lima ang sako is usually more natural.

Limang sako is just a noun phrase, not a full sentence. It means five sacks.

Examples:

• May limang sako. = There are five sacks.
• Bumili ako ng limang sako. = I bought five sacks.

But Lima ang sako is a complete sentence. It says that the number of sacks is five.

So:

• limang sako = five sacks
• Lima ang sako. = The sacks are five / There are five sacks

Usually sako means sack or bag, especially a large bag like one used for rice, grain, or cement.

The exact English word can depend on context. In some situations, bag may sound more natural, and in others sack is better.

So if your translation shows five sacks, that is very likely the intended meaning here.