Die koffieboon is in die koffiemeul.

Because die is the normal definite article in Afrikaans, meaning the. In this sentence, it appears once before koffieboon and once before koffiemeul because both nouns are definite:

• die koffieboon = the coffee bean
• die koffiemeul = the coffee grinder

Unlike English, Afrikaans uses the same article die for all genders, and it also does not change form the way articles do in some other languages.

Yes. Die can mean the with both singular and plural nouns.

For example:

• die koffieboon = the coffee bean
• die koffiebone = the coffee beans

So Afrikaans does not change the definite article based on number.

Afrikaans usually writes compound nouns as a single word. This is very common and is similar to German and often more consistent than English.

So:

• koffie
  • boon → koffieboon
• koffie
  • meul → koffiemeul

English sometimes writes these as two words, one word, or with a hyphen, but Afrikaans strongly prefers one combined word for compounds like these.

Yes. Meul literally means mill. In koffiemeul, it refers to a coffee grinder.

So even though the literal parts are something like coffee + mill, the natural English meaning is coffee grinder.

This sentence is a simple main clause, and Afrikaans often has the same basic word order as English in straightforward statements:

• Die koffieboon = subject
• is = verb
• in die koffiemeul = prepositional phrase

So the structure is:

Subject + verb + prepositional phrase

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

In this sentence, yes, is means is. It is the present-tense form of to be used with a singular subject.

Examples:

• Die koffieboon is klein. = The coffee bean is small.
• Die meul is oop. = The grinder is open.

So this part is very easy for English speakers to recognize.

Afrikaans does not have the same case system that languages like German use, and it does not change articles after prepositions the way some languages do.

So:

• in die huis = in the house
• in die koffiemeul = in the coffee grinder

The article stays die. This is one of the simpler parts of Afrikaans grammar.

You know it is singular from both the form of the noun and the verb:

• koffieboon is singular
• koffiebone is plural
• is also matches a singular subject

So Die koffieboon is ... means The coffee bean is ..., not The coffee beans are ...

It would be:

Die koffiebone is in die koffiemeul.

A useful thing to notice is that Afrikaans often uses is even where English would use are.

So:

• Die koffieboon is in die koffiemeul. = The coffee bean is in the coffee grinder.
• Die koffiebone is in die koffiemeul. = The coffee beans are in the coffee grinder.

Yes. In standard Afrikaans, the verb to be in the present tense is usually is for both singular and plural.

Examples:

• Die kind is hier. = The child is here.
• Die kinders is hier. = The children are here.

That is different from English, where is and are are separate forms.

A rough guide for an English speaker is:

• koffieboon ≈ KOFF-ee-bohn
• koffiemeul ≈ KOFF-ee-myul or KOFF-ee-male, depending on accent and how closely you are trying to imitate Afrikaans sounds

A few helpful notes:

• koffie sounds a bit like coffee, but with Afrikaans vowel quality
• boon does not sound exactly like English boon, though it is close enough as a beginner guide
• eu in meul is a sound English does not really have, so an approximation is normal for learners at first

Because Afrikaans does not capitalize ordinary nouns the way German does.

So you write:

• die koffieboon
• die koffiemeul

You only capitalize words when normal capitalization rules require it, such as at the beginning of a sentence or in proper names.

Yes, you could. Binne-in means something like inside or inside of, and it can sound a bit more specific than just in.

So:

• in die koffiemeul = in the coffee grinder
• binne-in die koffiemeul = inside the coffee grinder

Both are possible, but in is perfectly natural here.

Yes, there are three very useful beginner patterns here:

1. die = the
2. Compound nouns are usually written as one word
3. is works with both singular and plural in the present tense

So this one sentence gives you a lot of core Afrikaans structure in a very simple form.