Voorheen het die terreinplan die eiendomsgrens gewys.

Afrikaans very often uses the perfect tense where English might use a simple past.

So het ... gewys literally looks like has shown, but in normal Afrikaans it can simply mean showed or showed previously, depending on context.

• het = the auxiliary verb, like has/have
• gewys = the past participle of wys (show)

So:

• Voorheen het die terreinplan die eiendomsgrens gewys.
• Literally: Previously, the site plan has shown the property boundary.
• Natural English: Previously, the site plan showed the property boundary.

This is very normal Afrikaans usage.

Afrikaans follows a verb-second pattern in main clauses.

That means the finite verb usually comes second, even if something other than the subject comes first.

Here, Voorheen is placed first for emphasis or time reference, so the finite verb het must come next:

• Voorheen = first element
• het = second element
• die terreinplan = subject

So the structure is:

Voorheen | het | die terreinplan | die eiendomsgrens | gewys

If you started with the subject instead, you would get:

Die terreinplan het voorheen die eiendomsgrens gewys.

That is also correct.

Voorheen means previously, formerly, or earlier.

It is a time adverb. In this sentence, it tells you that this was true at an earlier time.

Examples:

• Voorheen was hy 'n onderwyser. = Previously he was a teacher.
• Voorheen het ons daar gewoon. = We used to live there / Previously we lived there.

In your sentence, it sets the time frame right at the beginning.

Terreinplan is a compound noun:

• terrein = site, ground, area
• plan = plan, layout, map-like plan

So terreinplan means something like:

• site plan
• layout plan
• sometimes plot plan, depending on context

Afrikaans forms compound nouns very freely, just like Dutch and German.

Because Afrikaans usually writes compound nouns as one word.

Eiendomsgrens is made up of:

• eiendom = property
• grens = boundary, border

Together:

• eiendomsgrens = property boundary

The -s- in the middle is a linking sound/spelling that often appears in compounds.

This is very common in Afrikaans:

• stadsraad = city council
• huisdeur = house door / front door
• eiendomsgrens = property boundary

English often writes these as two words, but Afrikaans usually joins them.

Because there are two separate nouns, and each one has its own definite article:

• die terreinplan = the site plan
• die eiendomsgrens = the property boundary

Unlike English, Afrikaans uses die as the definite article for all nouns, regardless of gender or number.

So:

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

That makes articles simpler than in many other languages.

The sentence follows a common Afrikaans pattern for a main clause with the perfect tense:

Time expression + finite verb + subject + object + past participle

So here:

• Voorheen = time expression
• het = finite auxiliary verb
• die terreinplan = subject
• die eiendomsgrens = object
• gewys = past participle

So the pattern is:

Voorheen | het | die terreinplan | die eiendomsgrens | gewys.

A useful thing to remember is that in this kind of clause, the participle often comes near the end.

Yes. The verb is wys (to show), and the past participle is gewys.

Afrikaans often forms past participles with ge-:

• maak → gemaak
• leer → geleer
• wys → gewys

So:

• Ek wys = I show
• Ek het gewys = I showed / I have shown

In your sentence:

• het ... gewys = showed / has shown

Sometimes, yes, depending on the wider context.

Because of voorheen, the sentence suggests that this was true earlier, but may not be true now. So in some contexts, English might naturally say:

• Previously, the site plan showed the property boundary.
• The site plan used to show the property boundary.

The exact best translation depends on whether the contrast with the present is important.

Yes. Afrikaans allows some flexibility with adverbs like voorheen.

For example:

• Voorheen het die terreinplan die eiendomsgrens gewys.
• Die terreinplan het voorheen die eiendomsgrens gewys.

Both are grammatical.

The first version gives slightly more emphasis to the time idea previously.
The second starts more neutrally with the subject the site plan.

A rough English-friendly guide would be:

FOOR-khee-en het dee tuh-RAYN-plan dee AY-en-doms-khrens khuh-VAISE

A few helpful pronunciation notes:

• v in Afrikaans is often close to English f/v, depending on speaker and context.
• g is usually the throaty sound heard in Dutch/Afrikaans, not the English g in go.
• wys sounds roughly like vace or vice, but with an Afrikaans w/v quality.
• die is pronounced more like dee, not English die.

Pronunciation varies by region and speaker, but that gives a useful approximation.

Yes, in many contexts you could say getoon instead of gewys, because toon also means show.

So you could have:

• Voorheen het die terreinplan die eiendomsgrens getoon.

The difference is subtle:

• wys is very common and broad
• toon can sound a little more formal or technical in some contexts

In a planning, mapping, or document context, both can work well.