Die merkpen is swart.

In this sentence, die means the.

A useful thing to know is that Afrikaans uses die for:

• singular nouns: die merkpen = the marker
• plural nouns: die merkpenne = the markers

Unlike some other languages, Afrikaans does not change the word for the based on gender.

No—modern Afrikaans does not use grammatical gender the way languages like German do.

So merkpen is not treated as masculine, feminine, or neuter in the grammar. That is why the article is simply die, not different gender-based forms.

Because Afrikaans very often writes compound nouns as a single word.

So:

• merk = mark / brand
• pen = pen

Together, merkpen means a marker pen or marker.

This is very common in Afrikaans. English sometimes uses two words where Afrikaans prefers one compound word.

Yes. is is the present-tense form of the verb to be.

In this sentence:

• Die merkpen = the subject
• is = the verb
• swart = the description

A very learner-friendly feature of Afrikaans is that the present tense of to be does not change the way English does. For example:

• Ek is = I am
• Jy is = you are
• Hy is = he is
• Ons is = we are

So is stays the same.

Here swart comes after the verb is, so it is being used predicatively: it describes the subject after a linking verb.

In that position, Afrikaans adjectives usually stay in their basic form:

• Die merkpen is swart. = The marker is black.

Compare that with an adjective directly before a noun:

• die swart merkpen = the black marker

So in this sentence, swart stays simple because it comes after is.

Yes, in this simple sentence it is very similar to English:

• Die merkpen = subject
• is = verb
• swart = complement/adjective

So the structure is:

Subject + verb + description

That is why it feels very familiar to an English speaker.

A rough English-friendly guide is:

dee merk-pen is svart

A few helpful notes:

• die sounds like dee, not like English die
• merkpen has a clear k and p
• swart is often closer to svart, because Afrikaans w sounds more like an English v

So a rough pronunciation is:

dee MERK-pen is svart

No. In this sentence, die is just the definite article the.

Afrikaans can also use die in relative clauses, but that is a different use. In Die merkpen is swart, it simply means the.

Yes, grammatically it would be correct, but the meaning changes:

• Die merkpen is swart. = The marker is black.
• 'n merkpen is swart. = A marker is black.

So the difference is definiteness:

• die = the
• 'n = a / an

The plural would be:

Die merkpenne is swart. = The markers are black.

Notice two useful things:

• merkpen becomes merkpenne
• the verb stays is

That second point is especially important for English speakers, because English changes is/are, but Afrikaans keeps is here.

Yes, but that is not a full sentence by itself. It means:

the black marker

That is a noun phrase, not a complete statement.

Compare:

• Die swart merkpen = the black marker
• Die merkpen is swart. = the marker is black

So the first one names something; the second one tells you something about it.