Ewan kung mapanganib ang plastik.

Yes. Ewan means I don’t know or no idea. In this sentence, it works like a shorter, more casual version of Hindi ko alam.

So:

• Ewan kung mapanganib ang plastik.
• Hindi ko alam kung mapanganib ang plastik.

Both mean essentially the same thing, but ewan is more conversational and informal.

That is normal here. Ewan already implies I don’t know in everyday speech, even though it does not literally show the pronoun ko.

A fuller version would be:

• Hindi ko alam kung mapanganib ang plastik.

In casual Filipino, speakers often just say ewan and leave the I understood from context.

Here, kung means if or whether.

So the structure is:

• Ewan = I don’t know
• kung mapanganib ang plastik = if/whether plastic is dangerous

In this sentence, kung introduces an indirect question: whether plastic is dangerous.

Mapanganib means dangerous.

It is an adjective. So:

• mapanganib ang plastik = plastic is dangerous

You may notice the prefix ma-, which often appears in Filipino adjectives. You do not need to break it apart every time you see it, but it is useful to recognize mapanganib as a single adjective meaning dangerous.

Both are possible, but mapanganib ang plastik is a very natural Filipino word order.

Filipino often puts the predicate first. So:

• Mapanganib ang plastik.
• Ang plastik ay mapanganib.

Both mean Plastic is dangerous.

The first one is often more natural in everyday speech. The second can sound a bit more formal or emphatic.

Ang marks the noun phrase that is being talked about as the topic or focus of the sentence.

In:

• Mapanganib ang plastik

ang plastik is the topic, roughly the plastic or plastic.

It does not always translate neatly into English as the. In many cases, it is better to think of ang as a grammatical marker rather than as a direct equivalent of an English article.

Most likely it means plastic in general.

So ang plastik can be understood as plastic as a material or category, not necessarily one specific object.

Context decides how specific it is. Without extra context, a learner should usually understand it as a general statement about plastic.

Not really. Ewan is common and natural in casual speech, but it is informal.

If you want a more neutral or formal way to say it, you can use:

• Hindi ko alam kung mapanganib ang plastik.

That version is safer in writing, schoolwork, or more formal conversation.

Usually, no. Ewan kung... most directly means I don’t know if...

I wonder if... in English can sound more thoughtful or curious, while ewan often sounds more like uncertainty or lack of knowledge.

So the best basic interpretation is:

• I don’t know if plastic is dangerous.

Plastik is a borrowed word from English plastic, but it is spelled in a way that fits Filipino spelling conventions.

It is pronounced roughly like PLAS-tik.

Many borrowed words in Filipino are adapted this way, so English speakers will often recognize them easily even when the spelling changes a little.