De partnercheck controleert de achtknoop.

Because Dutch normally writes compound nouns as a single word.

So partnercheck is made from:

• partner
• check

Together they form one noun: partnercheck.

This is very common in Dutch. English often uses two words where Dutch prefers one:

• school bag → schooltas
• bike lock → fietsslot
• partner check → partnercheck

If a compound gets long, Dutch may sometimes use a hyphen for readability, but the default is one word.

In Dutch, every singular noun is either a de-word or a het-word.

In this sentence:

• de partnercheck
• de achtknoop

Both nouns happen to be de-words.

Unfortunately, this is something you often have to learn together with the noun. There is not always a simple rule that lets you predict it. That said:

• many nouns referring to people are de-words
• many compound nouns take the gender/article of the last part

Since check is treated as a de-word, partnercheck is also de.

For learners, it is best to memorize nouns with their article:

• de partnercheck
• de achtknoop

Because controleert is the conjugated form that matches the subject de partnercheck.

The infinitive is controleren, meaning to check / to inspect.

Present tense:

• ik controleer = I check
• jij controleert = you check
• hij/zij/het controleert = he/she/it checks
• de partnercheck controleert = the partner check checks

Since de partnercheck is a singular subject, Dutch uses the singular present-tense form controleert.

That -t is the normal ending for the present tense with a singular non-ik subject.

Compare:

• ik controleer
• jij controleert
• hij controleert
• de partnercheck controleert

A simple way to think about it is:

• ik form: usually no final -t
• most other singular subjects: often -t

So the -t is there because the subject is de partnercheck, not ik.

The sentence follows normal Dutch main-clause word order:

• Subject: De partnercheck
• Verb: controleert
• Object: de achtknoop

So it is:

Subject + finite verb + object

This is very similar to English:

• The partner check / checks / the figure-eight knot

Dutch main clauses usually place the conjugated verb in the second position. Here, the subject comes first, so the verb comes right after it.

Achtknoop is another compound noun.

It is made from:

• acht = eight
• knoop = knot

So literally it is eight-knot, and in context it means the figure-eight knot.

Again, Dutch likes to combine noun parts into one word. English often needs more separate words, while Dutch can pack the idea into a compound.

Dutch compounds are usually formed by putting the parts directly together, often without spaces.

So:

• acht
  • knoop → achtknoop

Sometimes Dutch compounds do insert an extra linking sound or letter, such as -s- or -en-, but not always. There is no linking element here.

And because it is a compound noun, achtknoop is written as one word, not acht knoop.

A rough pronunciation guide is:

• acht: the ch is the Dutch guttural sound, like the ch in Scottish loch or German Bach
• knoop: starts with kn-, and the oo is a long vowel, roughly like the vowel in English note, but not exactly the same

Very roughly:

• achtknoop ≈ akht-knope

A few details:

• acht does not sound like English acht with a normal ch
• the k at the start of knoop is pronounced
• Dutch oo is a long sound

If pronunciation is difficult, focus first on saying the two parts clearly:

• acht
• knoop

Then combine them.

Roughly, it sounds like:

con-tro-LEERT

The last syllable is stressed.

A few helpful points:

• the ee in -eert is a long vowel
• the final -t is pronounced
• Dutch r may sound different from English r, depending on the speaker

It comes from the verb controleren, so if you know that word, controleert is just the present-tense singular form.

It can feel a little repetitive to an English speaker, because check already appears inside partnercheck, and then the verb controleert also means checks/inspects.

But grammatically it is perfectly normal.

The noun partnercheck refers to the procedure or safety check itself, while controleert is the action performed by that procedure.

So the structure is like:

• The partner check performs/checks the figure-eight knot

Dutch often allows this kind of repetition when the noun names a process and the verb describes what that process does.

Yes, in informal Dutch you may hear checken used as a verb, so checkt is possible in some contexts.

But controleert often sounds a bit more standard or formal.

So:

• De partnercheck controleert de achtknoop = more neutral/standard
• De partnercheck checkt de achtknoop = more informal, more influenced by English

Both are understandable, but controleert is a safer choice for standard Dutch.

Yes. Dutch, like English, can use the name of a procedure, system, test, or document as the subject of a sentence.

Examples of similar patterns:

• De test meet je niveau. = The test measures your level.
• De handleiding legt alles uit. = The manual explains everything.
• De partnercheck controleert de achtknoop.

So even though a partnercheck is a procedure, Dutch can still treat it as the grammatical subject.

The plural forms would be:

• de partnerchecks
• de achtknopen

And the verb would become plural too:

• De partnerchecks controleren de achtknopen.

Notice:

• plural nouns in Dutch use de
• the plural verb form here is controleren, without the singular -t

So the singular/plural contrast is:

• De partnercheck controleert de achtknoop.
• De partnerchecks controleren de achtknopen.