Mahalaga ang dunong sa pag-recycle.

No—mahalaga is not a verb here. It is an adjective meaning important.

In Filipino, sentences like this often do not need a separate word for is/are. So:

Mahalaga ang dunong sa pag-recycle.
literally works like: Important the knowledge in recycling.

A natural English translation is Knowledge of recycling is important or Knowledge about recycling is important.

So the pattern is:

Adjective + ang-marked topic

Here, mahalaga describes ang dunong sa pag-recycle.

Because Filipino often leaves out the equivalent of is/are in simple descriptive sentences.

In English, you say:

Knowledge is important.

In Filipino, you can simply say:

Mahalaga ang dunong.

This is completely normal. The relationship between the words already shows that dunong is being described as mahalaga.

Ang marks the topic or focus of the sentence.

In Mahalaga ang dunong sa pag-recycle, the phrase ang dunong sa pag-recycle is the thing being talked about—the thing described as important.

So:

• mahalaga = important
• ang dunong sa pag-recycle = the knowledge of/about recycling

A helpful beginner way to think about ang is that it often marks the main noun phrase in the sentence.

Dunong means knowledge, know-how, or understanding, often with a practical sense.

It can overlap with kaalaman, but they are not always identical in feel:

• dunong often suggests skill, know-how, or informed understanding
• kaalaman is a more general or formal word for knowledge

So dunong sa pag-recycle can sound like knowledge/know-how about recycling.

In everyday language, dunong can also appear in expressions related to being knowledgeable or skillful.

Sa pag-recycle means in recycling, about recycling, or when it comes to recycling, depending on context.

Here it tells you what kind of knowledge is important:

• dunong = knowledge
• sa pag-recycle = related to recycling

So together:

dunong sa pag-recycle = knowledge about recycling / know-how in recycling

The preposition sa is very flexible in Filipino. It can mean things like in, on, at, to, for, or about, depending on context.

Because pag- turns the borrowed word recycle into a noun-like form referring to the act/process of recycling.

So:

• recycle = the borrowed root
• pag-recycle = recycling / the act of recycling

This is a very common Filipino pattern:

• pag-aaral = studying / study
• pagluluto = cooking
• pagmamaneho = driving
• pag-recycle = recycling

So sa pag-recycle literally means in the act/process of recycling, but in natural English it becomes about recycling or in recycling.

Yes, borrowed English words are very common in Filipino, especially for modern, technical, or everyday terms.

So recycle is widely understandable, and pag-recycle is a normal Filipino-style way to use that borrowed root.

You may also encounter more formal or less common alternatives depending on context, but recycle and pag-recycle are very natural in modern usage.

Yes, Filipino word order is often more flexible than English, though some versions sound more natural in certain contexts.

For example, this is also possible:

Ang dunong sa pag-recycle ay mahalaga.

This has the same basic meaning: Knowledge about recycling is important.

The version with ay is often a bit more formal or explicit in structure.

Compare:

• Mahalaga ang dunong sa pag-recycle. = very natural, common
• Ang dunong sa pag-recycle ay mahalaga. = also correct, slightly more formal or emphatic on the topic

The whole topic is ang dunong sa pag-recycle.

That entire phrase is what mahalaga describes.

Breakdown:

• ang = topic marker
• dunong = knowledge
• sa pag-recycle = about/in recycling

So you should read it as one unit:

[ang dunong sa pag-recycle] = knowledge about recycling

not just:

ang dunong = the knowledge

with sa pag-recycle as an extra afterthought. It is part of the noun phrase.

Sometimes in loose English, yes, but about recycling or in recycling is usually closer.

If you say knowledge for recycling, that sounds a little unusual in English unless you mean knowledge that will be used for the purpose of recycling.

In this sentence, the idea is more:

• knowledge about recycling
• knowledge of recycling
• know-how in recycling

So for recycling is possible in some contexts, but it is usually not the best first translation here.

It sounds fairly neutral and natural. It could fit in education, environmental awareness, public information, or everyday discussion.

A few notes on tone:

• mahalaga is standard and neutral
• dunong is natural and understandable, with a slightly practical sense
• pag-recycle is modern and common because of the borrowed English root

So the sentence sounds like something you might hear in a lesson, campaign, article, or conversation about environmental responsibility.