Mereka akan bersama selamanya.

Mereka means they / them, but in standard Malay it is mainly used for people.

So in Mereka akan bersama selamanya, mereka means they.

A few useful points:

• It does not show gender. It can mean they for men, women, or a mixed group.
• It does not change form like English they/them. Malay pronouns usually stay the same.
• For animals or objects, speakers often avoid mereka in careful standard usage.

Akan is a future marker, so it shows that something will happen.

• Mereka akan bersama selamanya = They will be together forever

Without akan, Mereka bersama selamanya can still be understood, but it sounds more like a general statement or depends more on context.

So:

• akan = will / going to in many situations
• It is placed before the main predicate:
  mereka + akan + bersama + selamanya

No separate verb like are or be is needed here.

English says:

• They will be together forever

Malay says:

• Mereka akan bersama selamanya

Malay often does not use a word equivalent to English "to be" in sentences like this.
So bersama can function as the main idea of the predicate without adding a separate be verb.

That is very normal in Malay.

Here, bersama means together.

In other contexts, bersama can also mean with, depending on sentence structure.

Examples:

• Mereka bersama selamanya = They are together forever
• Saya bersama Ali = I am with Ali

So in your sentence, bersama is best understood as together.

Yes. Bersama is historically ber- + sama.

• sama often relates to same or together
• ber- is a common prefix in Malay

In practice, though, learners should usually treat bersama as a very common whole word meaning:

• together
• with

You do not need to analyze it every time you use it.

Yes. Selamanya means forever or for all time.

So:

• selamanya = forever

It comes from selama, which relates to duration (for, during, throughout), but selamanya has the established meaning forever.

A related form you may also see is:

• selama-lamanya = forever, often with a slightly more literary or emphatic feel

Broadly, yes.

Malay sentence:

• Mereka = subject
• akan bersama = future predicate
• selamanya = time/duration expression

So the order is:

Subject + future marker + predicate + time expression

That is fairly close to English:

• They will be together forever

One important difference is that Malay does not need the verb be.

Often, yes.

You may hear:

• Mereka bersama selamanya

This can still mean They are together forever or They will be together forever, depending on context.

Malay often relies on context for time, so akan is used when the speaker wants to make the future meaning clearer.

Compare:

• Mereka bersama selamanya = They are / will be together forever
• Mereka akan bersama selamanya = They will be together forever

A simple learner-friendly pronunciation guide:

• Mereka ≈ muh-REH-kah
• akan ≈ AH-kahn
• bersama ≈ ber-SAH-mah
• selamanya ≈ suh-lah-MAH-nyah

A few notes:

• Malay pronunciation is usually quite regular.
• The r in mereka and bersama is pronounced, though often lightly.
• ny in selamanya sounds like the ny in Spanish señor or the ni in onion.

It is natural and understandable Malay.

Mereka akan bersama selamanya is a normal way to express:

• They will be together forever

It may sound a little dramatic or romantic because of selamanya (forever), but grammatically and stylistically it is fine.

Usually in a sentence like this, mereka is understood as they.

However, in some contexts, especially when referring back to a known group, English may translate it as something like those people. Still, grammatically in this sentence, the best translation is simply they.

So:

• Mereka akan bersama selamanya = They will be together forever

Yes.

Because mereka just means they, the sentence does not specify who the group is. It could refer to:

• a romantic couple
• close friends
• family members
• any group of people

The exact interpretation depends on context. Because of bersama selamanya (together forever), many people will naturally think of a romantic meaning first, but it is not required by the grammar.