Bel as jy daar is.

Yes. Bel is the imperative form of bel (to call / to phone).

In Afrikaans, commands often use just the verb on its own, without a subject pronoun. So:

• Bel! = Call!
• Wag! = Wait!
• Kom! = Come!

So Bel as jy daar is is literally structured as:

• Bel = Call
• as jy daar is = when you are there

Because Afrikaans usually leaves out the subject in direct commands.

English can do this too:

• Call when you get there.
• not You call when you get there in a normal command

Afrikaans works the same way here. The subject you is understood.

That is a very common question. In Afrikaans, as can mean if, but in everyday speech it is also often used where English would say when or once, especially when the context makes the meaning clear.

So in this sentence, as jy daar is means:

• when you are there
• once you’re there
• sometimes almost when you arrive

Even though as can mean if, the intended meaning here is usually a time meaning, not a condition.

Yes, you could say:

• Bel wanneer jy daar is.

This also means Call when you are there.

But as is very common and natural in everyday Afrikaans. Wanneer can sound a bit more explicit or slightly more formal, depending on context.

So:

• Bel as jy daar is. = very natural everyday Afrikaans
• Bel wanneer jy daar is. = also correct

Because as introduces a subordinate clause, and in Afrikaans the conjugated verb often goes to the end of that clause.

So:

• jy is daar = you are there
  (normal main clause order)

But after as:

• as jy daar is = when you are there

This verb-final pattern is very important in Afrikaans subordinate clauses.

Compare:

• Ek weet jy is daar. = I know you are there.
• Bel as jy daar is. = Call when you are there.

No. In this sentence, daar just means there, and is means are / is.

The subject is jy (you), so:

• jy ... is = you are
• daar = there

So jy daar is means you are there.

This is different from an existential sentence like:

• Daar is 'n probleem. = There is a problem.

So although daar is can sometimes mean there is, that is not what is happening in as jy daar is.

Here, daar means there, referring to a place the listener is going to or has reached.

So the idea is:

• when you are there
• when you get there
• once you’ve arrived there

Afrikaans often uses wees daar (be there) in places where English might naturally say arrive.

Good observation. A fuller version would often be:

• Bel my as jy daar is. = Call me when you are there.

In the shorter sentence Bel as jy daar is, the object is left unstated because it is understood from context. In real life, that would usually mean call me, but the sentence itself just says Call when you are there.

So:

• Bel as jy daar is. = natural if the listener already knows whom to call
• Bel my as jy daar is. = more explicit

Yes. Jy is the normal informal singular you.

Afrikaans also has u, which is more formal or respectful, but in everyday spoken Afrikaans jy is much more common.

So this sentence sounds normal and conversational:

• Bel as jy daar is.

A more formal version might be:

• Bel as u daar is.

But that is less common in ordinary speech.

Very roughly, you can think of it like:

• Bel — like English bell
• as — with a short a, not like English ace
• jy — roughly like yay or yuy, depending on accent
• daar — roughly like dar with a long aa
• is — like iss

So a rough English-friendly approximation is:

• bell ahs yay daar iss

That is only approximate, but it gives you the basic shape of the sentence.