Die park is openbaar.

No. In this sentence, die means the.

It is usually pronounced roughly like dee, not like the English verb die.

So:

• die park = the park

No. Afrikaans does not use different definite articles for grammatical gender.

die is the normal definite article for nouns, regardless of gender, and it is also used with plural nouns.

So learners do not have to memorize noun genders for the article in the way they would in some other Germanic languages.

Because this is a simple main clause with a linking verb:

• Die park = subject
• is = verb
• openbaar = complement/adjective

So the pattern is:

• subject + verb + complement

That is very close to English: The park is public.

Mostly yes, but with one important difference: Afrikaans verbs do not change as much for person or number.

So you get:

• Die park is openbaar.
• Die parke is openbaar.

Even with a plural subject, Afrikaans still uses is here.
That is much simpler than English, where you have is and are.

Because openbaar is being used after is, so it is a predicative adjective. In that position, Afrikaans normally uses the basic form.

• Die park is openbaar.

But when the adjective comes before the noun, it often takes -e:

• die openbare park

So:

• after is: openbaar
• before the noun: openbare

Not usually. openbaar means public, not simply open in the sense of being open for entry or not closed.

If you want to say The park is open, Afrikaans would normally use:

• Die park is oop.

So these are different:

• Die park is openbaar. = The park is public.
• Die park is oop. = The park is open.

That is a very common point of confusion for English speakers.

You would usually make park plural as parke:

• Die parke is openbaar.

Notice two things:

• die stays the same
• is also stays the same

So only the noun changes here.

A rough English-friendly pronunciation is:

dee park is oh-pun-bahr

A few helpful notes:

• die sounds like dee
• park is close to English park
• is is short, like iss
• openbaar has stress near the end, and the last part sounds roughly like bahr

This is only an approximation, but it is good enough for a beginner.

No. Unlike German, Afrikaans does not capitalize all nouns.

So:

• Die park is openbaar.

Only Die is capitalized here because it is the first word of the sentence, not because it is a noun.
If the sentence were in the middle of a paragraph, die would be lowercase unless it started a new sentence.

Not by itself, if you want a full sentence with the same meaning.

Die openbare park means the public park, which is a noun phrase, not a complete sentence.

Compare:

• Die park is openbaar. = full sentence
• die openbare park = noun phrase

So if your goal is to say something about the park, you need the verb:

• Die park is openbaar.