Tagas ang dahilan.

In Filipino, it is very common for the predicate to come first.

So in Tagas ang dahilan, the structure is:

• Tagas = the predicate
• ang dahilan = the topic/focus part

A very natural English-style rearrangement is:

• The reason is a leak
• or A leak is the reason

English usually prefers subject + verb + complement, but Filipino often allows or prefers predicate-first order in simple statements like this.

A more English-like Filipino order is also possible:

• Ang dahilan ay tagas.

This means essentially the same thing, but Tagas ang dahilan is shorter and very natural.

Ang marks the noun phrase that is being treated as the main topic or focused noun in the sentence.

Here:

• ang dahilan = the reason / the cause

In this sentence, ang dahilan is the part being identified or described by tagas.

So the sentence works like:

• Tagas = what it is
• ang dahilan = the thing being identified

You do not translate ang word-for-word every time. Depending on context, it can correspond to the, sometimes a, or sometimes it just shows the grammatical role of the noun phrase.

No. Filipino often leaves out the verb to be in simple equational or descriptive sentences.

So instead of saying something like Tagas ay ang dahilan or inserting a separate word for is, Filipino can simply say:

• Tagas ang dahilan.

This is normal Filipino grammar.

Another common pattern uses ay:

• Ang dahilan ay tagas.

Here, ay helps connect the topic and predicate, but it is not always necessary. In many everyday sentences, Filipino simply places the predicate first and leaves out an overt is.

In this sentence, tagas functions as the predicate, and depending on context it can feel noun-like or adjective-like in English.

If the intended meaning is something like a leak or leakage, then it is behaving more like a noun:

• The reason is a leak.

In Filipino, words are often more flexible than in English. A word can function as a predicate without needing a special copula like is.

So the important point for the learner is:

• tagas is the identifying/describing element in the sentence
• Filipino does not always force a strict noun/adjective distinction the way English does

Yes. That is a very natural alternative.

Compare:

• Tagas ang dahilan.
• Ang dahilan ay tagas.

Both can mean the same thing.

The difference is mainly in structure and emphasis:

• Tagas ang dahilan puts the predicate first, which is very common in Filipino.
• Ang dahilan ay tagas starts with the topic ang dahilan, then uses ay to connect it to the predicate.

For learners, it is useful to recognize both patterns because they are both common in Filipino.

Because may tagas means something different.

• May tagas = there is a leak / has a leak
• Tagas ang dahilan = the reason is a leak

So:

• May tagas. = There is a leak.
• Tagas ang dahilan. = A leak is the cause/reason.

The sentence you were given is not just stating that a leak exists. It is identifying what the reason/cause is.

It can mean either reason or cause, depending on context.

• dahilan often translates as reason
• in some situations, cause sounds more natural in English

So Tagas ang dahilan might be understood as:

• The reason is a leak
• The cause is a leak

If the broader situation is mechanical or physical, cause may sound more natural. If someone is explaining why something happened, reason may sound more natural.

It is pronounced roughly as TAH-gahs.

A few pronunciation notes:

• t is a clean, unaspirated t
• both a vowels are like the a in father
• g is always a hard g, as in go
• stress is normally on the first syllable: TA-gas

So a simple guide is:

• TAH-gahs

Yes, and that is something learners should watch out for.

Tagas can refer to a leak or leakage, but Filipino also has similar-looking forms related to taga-, which can mean from a place or indicate an agent, as in words like:

• taga-Maynila = someone from Manila

That is a different pattern.

So in Tagas ang dahilan, tagas should be understood from the sentence context as referring to a leak/leakage, not someone from somewhere.

The pattern is:

• Predicate + ang + topic

In this sentence:

• Tagas = predicate
• ang dahilan = topic noun phrase

This is a very common Filipino pattern for identification and description.

You can compare it with sentences like:

• Guro ang kapatid ko. = My sibling is a teacher.
• Mabait ang bata. = The child is kind.
• Problema ang ulan. = The rain is the problem.

So Tagas ang dahilan follows a very common and useful pattern in Filipino grammar.