Die kornea en die retina is in die oog.

Die means the.

It appears before kornea, retina, and oog because all three nouns are being used definitely:

• die kornea = the cornea
• die retina = the retina
• die oog = the eye

A useful thing to know is that Afrikaans uses die as the definite article for all genders, and also for both singular and plural nouns. So unlike in some other languages, the article does not change form.

In Afrikaans, the present tense of wees (to be) is is for all persons and numbers.

So you get:

• ek is = I am
• jy is = you are
• hy/sy is = he/she is
• ons is = we are
• hulle is = they are

That means is is correct even with a compound subject like die kornea en die retina.

This is different from English, where you must switch between am / is / are.

Yes. This is the normal basic word order for a simple statement in Afrikaans:

Subject + verb + rest of the sentence

So here:

• Die kornea en die retina = subject
• is = verb
• in die oog = prepositional phrase

So the structure is completely straightforward.

En means and.

So:

• die kornea en die retina = the cornea and the retina

It is the normal coordinating conjunction used to join two nouns.

Yes, oog means eye.

Here, die oog means the eye. In an anatomical or educational sentence like this, the eye can be used in a general sense, not necessarily one specific eye that has already been mentioned.

So the sentence can be understood as a general factual statement about eye anatomy.

A related form:

• oë = eyes

So:

• die oog = the eye
• die oë = the eyes

Yes, they are very close to the English scientific terms.

• kornea corresponds to English cornea
• retina is the same as English retina

A learner will often notice that medical and scientific vocabulary in Afrikaans is similar to English or other European languages, although spelling may differ a little. Here, cornea becomes kornea, with k instead of c.

No. That is one of the simpler features of Afrikaans grammar.

Die stays die:

• for masculine nouns
• for feminine nouns
• for neuter nouns
• for singular nouns
• for plural nouns

So Afrikaans does not make the learner change the definite article the way some other languages do.

Examples:

• die oog = the eye
• die oë = the eyes

Same article, different noun form.

In this sentence, die kornea en die retina is the clear and standard way to say it.

Repeating die makes it obvious that both nouns are separate definite items:

• die kornea
• die retina

For a learner, it is safest to keep the article with each noun when the sentence is built like this.

No. In Afrikaans, die as the article is pronounced roughly like dee, not like the English verb die.

That is a very common learner trap.

So in this sentence, die sounds like dee each time.

Afrikaans normally uses a double negative.

So the negative version would be:

Die kornea en die retina is nie in die oog nie.

Notice the two nie words:

• one after the verb phrase area
• one at the end of the clause

That double negative pattern is a major feature of standard Afrikaans.

In die oog is a prepositional phrase.

• in = in
• die oog = the eye

Together, it tells you where the cornea and retina are located.

So it is answering a location question: Where are they?
Answer: in the eye.