Jeg markerer de nye ord med gult og bruger viskelæderet, hvis jeg skriver forkert.

In Danish, if the same subject applies to two coordinated verbs, you often mention the subject only once.

So:

• Jeg markerer de nye ord med gult
• og bruger viskelæderet

means I highlight the new words in yellow and use the eraser.

The second jeg is understood automatically. You could say Jeg markerer de nye ord med gult, og jeg bruger viskelæderet ..., but that sounds more repetitive.

Markerer is the present tense of at markere.

A very useful pattern in Danish is:

• at markere = to mark / highlight
• jeg markerer = I mark / I am marking

Danish present tense often ends in -er:

• jeg skriver = I write / I am writing
• jeg bruger = I use / I am using
• jeg markerer = I mark / I am marking

Like in Danish generally, the present tense can cover both English simple present and present continuous, depending on context.

De nye ord means the new words.

Here:

• de = the, for plural nouns
• nye = new
• ord = words

In Danish, when a noun phrase is definite and has an adjective, you usually use:

• a definite article/determiner
• the adjective
• the noun

So:

• nye ord = new words
• de nye ord = the new words

Because the sentence refers to a specific set of words, Danish uses de nye ord.

This is a very common learner question.

Gul is the basic form of the adjective yellow.
Gult is the neuter singular form.

In the expression med gult, Danish is using the color more like with yellow or in yellow. In practice, this means using yellow color.

Compare:

• gul = yellow
• et gult kort = a yellow card
• jeg markerer med gult = I highlight with yellow / in yellow

So gult is not describing ord directly here. It belongs to the expression med gult.

Normally, no. In this sentence, med gult is the natural form.

Color words often appear in this neuter form when they are used more abstractly, like a substance, shade, or color medium:

• skrive med blåt = write in blue
• male med rødt = paint with red
• markere med gult = highlight in yellow

So a learner should usually remember this as a set pattern: med + color in neuter form.

Viskelæderet is the definite form: the eraser.
Et viskelæder would mean an eraser.

The noun is:

• et viskelæder = an eraser
• viskelæderet = the eraser

Danish often uses the definite form when referring to a specific, familiar object in the situation, such as the eraser you are using while writing.

This is very common in Danish:

• jeg åbner døren = I open the door
• jeg tager bogen = I take the book
• jeg bruger viskelæderet = I use the eraser

Hvis means if.

It introduces a condition:

• hvis jeg skriver forkert = if I write incorrectly / if I make a mistake when writing

So the structure is:

• main action: Jeg markerer ... og bruger viskelæderet
• condition: hvis jeg skriver forkert

It tells you when the eraser is used: only in the situation where the speaker writes something wrong.

Sometimes learners confuse hvis and når.

• hvis = if
• når = when

In this sentence, hvis is better because the idea is conditional: in case I write something wrong.

If you said når jeg skriver forkert, it would suggest something more like when I write incorrectly, which can sound as if it is expected to happen, or happens regularly.

So:

• hvis jeg skriver forkert = if I write it wrong
• når jeg skriver forkert = when I write it wrong

The first is the more natural choice for a condition like this.

Here forkert is functioning like an adverb, even though it comes from the adjective meaning wrong / incorrect.

So:

• forkert = wrong / incorrectly
• skrive forkert = to write incorrectly / to write something wrong

This is very common in Danish. Some words can be used after verbs in a way that feels very natural in English too:

• han taler højt = he speaks loudly
• du svarer rigtigt = you answer correctly
• jeg skriver forkert = I write incorrectly / I write something wrong

It does not need an object here.

Jeg skriver forkert is a complete and natural expression meaning:

• I write incorrectly
• I write something wrong
• I make a writing mistake

Danish often leaves the object unstated when it is obvious or unimportant. The focus here is on the mistake itself, not on exactly which word was written.

Yes. Danish subordinate clauses often have different word order from main clauses.

Main clause:

• Jeg skriver forkert

Subordinate clause with hvis:

• hvis jeg skriver forkert

Here the subject jeg comes before the verb skriver, which is normal in subordinate clauses.

This contrasts with many Danish main clauses, where the verb often comes in the second position. Learners usually remember this as:

• main clause: verb often in position 2
• subordinate clause: subject usually comes before the verb

Literally, med gult is with yellow, but in natural English the best translation is often in yellow or using yellow.

So the Danish phrasing focuses on the tool or medium:

• markere med gult = mark using yellow
• natural English: highlight in yellow

This is a good example of where the most literal translation is not always the most natural one.

Here are the main dictionary forms:

• jeg = I
• at markere → markerer = to mark / highlight → marks / am marking
• de = the
• ny → nye = new
• et ord → ord = a word → words
• med = with
• gul → gult = yellow
• at bruge → bruger = to use → use / am using
• et viskelæder → viskelæderet = an eraser → the eraser
• hvis = if
• at skrive → skriver = to write → write / am writing
• forkert = wrong / incorrectly

This is often a helpful way to study the sentence: identify the base form, then the form actually used.