Polis mengesan ancaman itu.

This sentence follows the very common Malay pattern:

Subject + Verb + Object

• Polis = subject
• mengesan = verb
• ancaman itu = object

So it works very much like English The police detected that threat in terms of basic word order.

It can depend on context.

• polis often means the police in a general sense
• In some contexts, it can also refer to a police officer

If you want to make a police officer very explicit, Malay often uses:

• seorang polis = a police officer

In Polis mengesan ancaman itu, the most natural reading is usually the police.

Malay usually does not use articles like a, an, and the the way English does.

So:

• polis can mean police, the police, or sometimes a police officer, depending on context

Malay often leaves definiteness to context, or uses words like itu and ini when needed.

Itu means that, and it comes after the noun in Malay.

So:

• ancaman = threat
• ancaman itu = that threat

This is a very important difference from English:

• English: that threat
• Malay: ancaman itu

Malay demonstratives such as ini and itu usually come after the noun they describe.

Yes. In many contexts, itu can make a noun phrase sound definite, so ancaman itu can be understood as:

• that threat
• the threat

Which one sounds best in English depends on context.

Mengesan means something like:

• to detect
• to trace
• to identify
• sometimes to track down

The exact English translation depends on context. In this sentence, detect is a very natural choice.

Because mengesan is a derived verb built from the root kesan.

The prefix meN- is a very common Malay verb-forming prefix for active verbs. When it attaches to some roots, the spelling changes.

Here the root is:

• kesan

With the prefix, it becomes:

• meN- + kesan → mengesan

A useful thing to notice: when meN- is added to a root beginning with k, the k often disappears.

So this is a normal pattern in Malay morphology.

No, not by itself.

Malay verbs usually do not change form for tense the way English verbs do. So mengesan does not specifically mean:

• detected
• detects
• is detecting

The time is usually understood from context, or from time words such as:

• semalam = yesterday
• tadi = earlier
• sekarang = now
• akan = will / going to

So Polis mengesan ancaman itu could mean different things in English depending on context, though The police detected that threat is a common translation.

Yes. Mengesan is an active transitive verb.

That means:

• the subject is doing the action
• the verb takes a direct object

Here:

• Polis performs the action
• ancaman itu receives the action

So the sentence is active: The police detected that threat.

A common passive version would be:

Ancaman itu dikesan oleh polis.

Breakdown:

• Ancaman itu = that threat
• dikesan = was detected
• oleh polis = by the police

So this means That threat was detected by the police.

This is useful because Malay uses both active and passive structures quite often.

Not if you want it to describe ancaman.

In standard Malay, itu normally comes after the noun it modifies:

• ancaman itu = that threat

If you put itu after a different noun, it modifies that noun instead.

For example:

• polis itu = that police officer / that police unit

So word placement matters.

No, the meaning changes.

• Polis mengesan ancaman itu = The police detected that threat
• Polis itu mengesan ancaman = That police officer / that police unit detected a threat

In the second sentence, itu describes polis, not ancaman.

So in Malay, you need to pay close attention to which noun itu follows.

No. Malay nouns usually do not change form for singular and plural the way English nouns do.

So polis can refer to:

• one police officer, in some contexts
• the police generally
• multiple police personnel

Context tells you which meaning is intended.

If Malay wants to make plurality especially clear, it can do so in other ways, but often it simply leaves it unmarked.

A simple learner-friendly pronunciation is roughly:

meng-eh-san

A few helpful points:

• the ng is like the sound in sing
• the vowels are usually pronounced clearly
• stress in Malay is generally not as strong or dramatic as in English

So try to say it smoothly rather than heavily stressing one syllable.

Yes. It is short, grammatical, and natural.

It is the kind of straightforward sentence Malay often uses:

• subject first
• active verb with meN-
• object after the verb
• itu after the noun it modifies

So it is a very good example of basic Malay sentence structure.