Die getuie skryf daarmee.

It is the definite article, equivalent to the in English.

A useful thing to remember is that Afrikaans uses die:

• for singular nouns
• for plural nouns
• without grammatical gender changes

So die is much simpler than articles in many other languages.

Yes. Getuie can refer to a witness of either sex.

Afrikaans nouns usually do not have grammatical gender, so the noun itself does not change depending on whether the witness is male or female. If that matters, it is usually shown by context or later pronouns such as hy or sy.

No. In Afrikaans, verbs usually do not change form in the present tense according to the subject.

So you get:

• ek skryf
• jy skryf
• die getuie skryf
• hulle skryf

This is one of the nice simplifications Afrikaans has compared with English.

It can often cover either idea, depending on context.

The simple present in Afrikaans is quite flexible. It may describe:

• a general or habitual action: writes
• an action happening now: is writing

If you want to make the ongoing sense especially clear, Afrikaans often uses a form like is besig om te skryf.

Daarmee is a built-together form meaning with that or with it.

It is made from:

• daar = there / that
• mee = a form related to met = with

Afrikaans often uses this kind of form when referring to things, ideas, or situations, rather than using a separate preposition plus pronoun.

Because in these compound forms, met appears as mee.

That gives you forms like:

• hiermee = with this
• daarmee = with that / with it
• waarmee = with what / with which

So daarmee is the normal correct form, not daarmet.

Usually, daarmee is the natural choice.

Afrikaans normally prefers these built forms when the reference is to a thing, idea, or situation. So daarmee is what a learner should expect and use most of the time.

A separate preposition is still normal with people:

• met hom
• met haar
• met hulle

You might occasionally hear a separate form in special emphatic or contrastive contexts, but daarmee is the standard everyday pattern here.

Because this is a normal main clause, and Afrikaans keeps the finite verb in the second position.

Here the order is:

• Die getuie = subject
• skryf = finite verb
• daarmee = the rest of the clause

So the verb comes second, which is very typical of Afrikaans.

Yes. That is possible.

If you put Daarmee first for emphasis, the verb still has to stay in second position:

• Daarmee skryf die getuie.

That is a very common Afrikaans pattern:

• first element
• verb second
• subject after the verb if something else has been moved to the front

You would normally use Afrikaans double negation:

Die getuie skryf nie daarmee nie.

Afrikaans usually uses:

• one nie inside the clause
• another nie at the end of the clause

That double-nie pattern is one of the best-known features of standard Afrikaans.