Malinis ang kapaligiran.

Because Filipino often uses predicate-first word order in simple descriptive sentences.

So in Malinis ang kapaligiran:

• malinis = the description/predicate (clean)
• ang kapaligiran = the topic being described (the environment / the surroundings)

A very literal breakdown is:

• Clean
  • the environment

In natural English, we usually reverse that and say The environment is clean.

Yes—at least from an English point of view.

Filipino often has no spoken copula in simple present-tense descriptive sentences. In English, you need is/are, but in Filipino you can simply say:

• Malinis ang kapaligiran.

This already means The environment is clean or The surroundings are clean.

So nothing is actually missing in Filipino grammar.

Ang is a very common marker in Filipino. In this sentence, it marks kapaligiran as the topic or focused noun phrase.

So:

• ang kapaligiran = the environment / the surroundings

It does not translate perfectly as the, but in many simple sentences that is often the closest natural English equivalent.

Kapaligiran usually means:

• environment
• surroundings
• one’s surroundings

The exact English translation depends on context.

For example:

• in an ecological context: the environment
• in a physical place context: the surroundings

So Malinis ang kapaligiran could mean either:

• The environment is clean
• The surroundings are clean

Because kapaligiran here is being treated as a singular or mass idea.

If you mean the environment as one concept, ang kapaligiran is correct.

Also, even when English uses a plural-like idea such as surroundings, Filipino often still uses a singular-looking noun:

• ang kapaligiran = the surroundings

You would not normally say ang mga kapaligiran in this sentence.

Yes. That is also correct.

You have two common patterns:

• Malinis ang kapaligiran.
• Ang kapaligiran ay malinis.

They mean the same thing. The difference is mainly in style and emphasis.

• Malinis ang kapaligiran is very natural and common.
• Ang kapaligiran ay malinis sounds a bit more formal, structured, or emphatic.

No. Filipino adjectives do not change the way English adjectives and verbs sometimes do.

So malinis stays malinis whether the noun is singular or plural in meaning.

Examples:

• Malinis ang silid. = The room is clean.
• Malinis ang mga silid. = The rooms are clean.

The adjective itself does not change.

You use hindi before the predicate:

• Hindi malinis ang kapaligiran.

That means:

• The environment is not clean.
• The surroundings are not clean.

This is the normal way to negate this kind of sentence.

It comes from the root paligid, which relates to what is around something.

With the affixes ka- and -an, it becomes kapaligiran, meaning something like:

• surrounding area
• environment
• surroundings

This is useful to know because many Filipino words are built from roots plus affixes.

A rough English-friendly pronunciation is:

• mah-LEE-nis ang kah-pah-lih-ghee-RAHN

A few notes:

• malinis has stress on LEE
• kapaligiran is commonly stressed near the end
• ng in ang sounds like the ng in sing
• Filipino vowels are usually simple and pure: a, e, i, o, u

So try to keep the vowels short and clear, rather than turning them into English-style diphthongs.

It can do either, depending on context.

It may refer to:

• the environment in general
• the surroundings in a particular area
• the condition of a place

For example:

• talking about a town or park: The surroundings are clean
• talking about ecology or public sanitation: The environment is clean

Context tells you which English translation sounds best.

Yes. This sentence pattern is very common.

You can use:

• Maganda ang kapaligiran. = The environment/surroundings are beautiful.
• Tahimik ang kapaligiran. = The environment/surroundings are quiet.
• Mabaho ang kapaligiran. = The environment/surroundings smell bad / are filthy-smelling.

So the pattern is:

• [Adjective] + ang + [noun]

That is one of the most useful basic Filipino sentence patterns to learn.