Mababa ang dalas ng pagbisita.

Because Filipino often uses predicate-first word order.

In this sentence:

• mababa = the predicate, describing something as low
• ang dalas ng pagbisita = the topic, the thing being described

So the structure is:

• Mababa
  • ang dalas ng pagbisita
• literally: Low is the frequency of visiting

In more English-like order, that would be The frequency of visits is low, but predicate-first order is very normal in Filipino.

Ang marks the topic of the sentence.

Here, it marks:

• ang dalas ng pagbisita = the frequency of visits / the frequency of visiting

A learner may want to translate ang as the, and sometimes that helps, but it is not exactly the same as the English article the. Its main job is grammatical: it marks the noun phrase that the sentence is centered on.

They are related, but they are different parts of speech:

• dalas = frequency; a noun
• madalas = frequent / often; an adjective or adverb

So in this sentence, dalas is used because the sentence talks about frequency as a thing:

• Mababa ang dalas ng pagbisita. = The frequency of visits is low.

If you use madalas, you get a different structure:

• Madalas ang pagbisita. = The visits are frequent.

For the opposite idea, everyday Filipino often uses:

• Bihira ang pagbisita. = Visits are rare.
• Madalang ang pagbisita. = Visits are infrequent.

Here, ng works like of in English.

• dalas ng pagbisita = frequency of visiting / frequency of visits

So ng links dalas and pagbisita.

This is a very common use of ng in Filipino. It can have other functions in other sentences, but here it is basically showing a relationship similar to of.

Pagbisita is a verbal noun or action noun meaning visiting or the act of visiting.

It is formed from the root bisita with the prefix pag-:

• bisita = visit / guest
• pagbisita = visiting, visitation, the act of visiting

So:

• dalas ng pagbisita = frequency of visiting

This kind of pag- form is very common in Filipino when turning an action into a noun.

Both are possible, but they are used in different ways.

Mababa ang dalas ng pagbisita is a full sentence:

• The frequency of visits is low.

Mababang dalas ng pagbisita is just a noun phrase:

• low frequency of visits

The difference is:

• mababa = predicate adjective in a full sentence
• mababang = adjective directly modifying a noun, so it needs the linker -ng

Compare:

• Mababa ang dalas ng pagbisita. = full sentence
• mababang dalas ng pagbisita = phrase only

Yes. That is also grammatical.

It means the same thing as:

• Mababa ang dalas ng pagbisita.

The version with ay is more like:

• Ang dalas ng pagbisita ay mababa.

This word order can sound more formal, more written, or more deliberate. In everyday Filipino, the predicate-first version is often more natural.

Yes, but it sounds a bit formal or analytical.

It would fit well in contexts like:

• reports
• surveys
• statistics
• academic writing
• formal discussion

In casual conversation, people might say something simpler, such as:

• Bihira ang pagbisita.
• Hindi madalas ang pagbisita.
• Bihira siyang bumisita. if you mean He/She rarely visited

So the original sentence is correct and natural, but somewhat more formal than everyday speech.

Here it usually means visiting in general or visits as a repeated activity.

That makes sense because dalas means frequency, and frequency normally refers to repeated events, not just one event.

So the sentence suggests:

• visits happen, but not often

If you wanted to talk about a single visit, you would usually make that clearer in another way, such as:

• isang pagbisita = one visit

Yes. Filipino, like English, can use low and high with abstract ideas such as frequency, level, amount, and rate.

So these are natural patterns:

• mababa ang dalas = the frequency is low
• mataas ang dalas = the frequency is high

This is similar to English expressions like:

• low frequency
• high frequency

So even though mababa literally means low, it works naturally here with an abstract noun like dalas.