Hulle ontruim die werkplek onmiddellik.

In Afrikaans, verbs usually do not change form according to the subject.

So you get:

• Ek ontruim = I evacuate
• Jy ontruim = you evacuate
• Hy/Sy ontruim = he/she evacuates
• Ons ontruim = we evacuate
• Hulle ontruim = they evacuate

This is much simpler than English, where you have I evacuate but he evacuates.

Hulle usually means they or them, depending on context.

In this sentence, it is the subject, so it means they:

• Hulle ontruim... = They evacuate...

Afrikaans often uses the same form where English distinguishes between they and them, so context matters.

Yes. Ontruim is a common Afrikaans verb meaning:

• to evacuate
• to clear out
• sometimes to vacate, depending on context

In a safety or emergency context, ontruim is exactly the kind of word you would expect.

Examples:

• Hulle ontruim die gebou. = They evacuate the building.
• Ons moet die area ontruim. = We must evacuate the area.

Afrikaans often uses the simple present tense where English might use either:

• They evacuate
• They are evacuating

So Hulle ontruim die werkplek onmiddellik can often be understood as either a general present or an action happening now, depending on context.

If you really want to emphasize an ongoing action, Afrikaans can use structures like:

• Hulle is besig om die werkplek te ontruim.
  = They are busy evacuating the workplace.

But in ordinary language, the simpler form is very common.

Die is the Afrikaans definite article, meaning the.

So:

• die werkplek = the workplace

Unlike English, Afrikaans does not have separate forms like the vs. a/an based on sound. Also, die is used for all genders and numbers as the definite article.

Examples:

• die huis = the house
• die man = the man
• die vrou = the woman
• die kinders = the children

Werkplek is a compound noun:

• werk = work
• plek = place

So literally it is workplace = work place.

Compound nouns are very common in Afrikaans, just as in English.

Other examples:

• slaapkamer = bedroom
• skoolbus = school bus
• polisiekantoor = police office / police station

Onmiddellik means immediately and functions as an adverb.

In a straightforward main clause, Afrikaans often places adverbs like this after the object:

• Hulle ontruim die werkplek onmiddellik.

That word order sounds natural and clear.

You may also see adverbs in other positions for emphasis, for example:

• Hulle ontruim onmiddellik die werkplek.
• Onmiddellik ontruim hulle die werkplek.
  (more marked, often for emphasis)

So the original sentence uses a very normal, neutral word order.

A rough English-friendly guide:

• ontruim ≈ on-TRAYM or on-TRUYM
• onmiddellik ≈ on-muh-DIL-ik

A few helpful notes:

• ui in Afrikaans is a distinctive vowel that English does not really have. English speakers often need practice with it.
• The stress in ontruim is usually on the second part: -truim
• The stress in onmiddellik is usually around -mid- / -dell-, depending on accent

If you are learning pronunciation, it is worth listening to native audio for ui, because that sound appears in many common Afrikaans words.

Yes, depending on context.

Ontruim can cover both ideas:

• evacuate in an emergency sense
• vacate/clear out in a more general sense

So if this sentence appears in a safety notice, evacuate is the best translation.
If it appears in another context, vacate or clear might fit better.

Afrikaans usually uses double negation.

So:

• Hulle ontruim die werkplek onmiddellik.
  = They evacuate the workplace immediately.

becomes:

• Hulle ontruim nie die werkplek onmiddellik nie.
  = They do not evacuate the workplace immediately.

Notice the two nie words:

1. one after the verb
2. one at the end of the clause

That is a very important pattern in Afrikaans.

Yes, in this case it is quite similar.

The pattern is:

• Hulle = subject
• ontruim = verb
• die werkplek = object
• onmiddellik = adverb

So it follows a basic Subject–Verb–Object structure:

• They evacuate the workplace immediately.

This makes the sentence fairly easy for an English speaker to recognize.

Yes. That would be a passive version:

• Die werkplek word onmiddellik ontruim.
  = The workplace is evacuated immediately.

Compare:

• Hulle ontruim die werkplek onmiddellik.
  = They evacuate the workplace immediately.
  active: focuses on who does the action

• Die werkplek word onmiddellik ontruim.
  = The workplace is evacuated immediately.
  passive: focuses on the workplace

Both are correct, but they emphasize different things.