Jeg skifter gear forsigtigt, hvis vejen er glat.

Because skifter is the present tense form of the verb at skifte.

• at skifte = to change / to shift
• jeg skifter = I change / I shift

In Danish, the present tense usually ends in -r:

• jeg kører = I drive
• jeg bremser = I brake
• jeg skifter = I shift / change

So jeg skifte would be ungrammatical here.

Skifter gear means change gear or shift gears in the context of driving.

A few useful points:

• at skifte = to change
• gear = gear / gears

In Danish, skifte gear is a natural expression for changing gears in a car. English often says either change gear or shift gears, depending on the variety of English.

Because in Danish, as in English, this kind of expression often uses the noun without an article.

So:

• skifte gear = change gear / shift gears

This is similar to fixed expressions in English like:

• drive home
• go to school
• change gear

You could use an article in other contexts, for example if you are talking about one specific gear:

• Jeg skifter til et højere gear. = I shift to a higher gear.

But in skifter gear, the noun is used in a more general, idiomatic way.

Because forsigtigt is being used as an adverb, not as an adjective.

• forsigtig = careful / cautious
• forsigtigt = carefully / cautiously

Here it describes how the person changes gear:

• Jeg skifter gear forsigtigt = I change gear carefully

This is very common in Danish: many adverbs are formed by adding -t to the adjective.

Examples:

• hurtig → hurtigt = quick → quickly
• forsigtig → forsigtigt = careful → carefully

Because hvis means if in a conditional sense.

In this sentence, the meaning is:

• I change gear carefully if the road is slippery.

That is a condition, so hvis is the right word.

Om can sometimes mean if/whether, but usually when introducing an indirect yes/no question, not a condition.

Compare:

• Jeg ved ikke, om vejen er glat. = I don’t know whether the road is slippery.
• Jeg skifter gear forsigtigt, hvis vejen er glat. = I change gear carefully if the road is slippery.

Because vejen means the road, while vej means road.

Danish usually adds the definite article as an ending:

• en vej = a road
• vejen = the road

So:

• hvis vejen er glat = if the road is slippery

This is one of the first big differences English speakers notice: Danish often puts the at the end of the noun instead of using a separate word.

Here, glat is the correct form meaning slippery.

The adjective is used predicatively after er:

• vejen er glat = the road is slippery

A useful thing to know is that some Danish adjectives look the same in more than one form. Glat is one of them.

Compare:

• en glat vej = a slippery road
• et glat gulv = a slippery floor
• glatte veje = slippery roads

So in this sentence, glat is exactly right.

It is normal subordinate clause word order.

• hvis = if
• vejen = the road
• er = is
• glat = slippery

So the structure is:

• hvis + subject + verb + complement

In this particular sentence, the order looks very similar to English.

A useful extra point: in Danish subordinate clauses, words like ikke usually come before the finite verb.

For example:

• hvis vejen ikke er glat = if the road is not slippery

That is a classic Danish subordinate-clause pattern.

Because hvis vejen er glat is a subordinate clause, and Danish often places a comma before such clauses.

So:

• Jeg skifter gear forsigtigt, hvis vejen er glat.

That comma is very normal.

A small extra note: Danish comma rules have some variation depending on style and system, so you may sometimes also see:

• Jeg skifter gear forsigtigt hvis vejen er glat.

But the version with the comma is very common and perfectly correct.

Not necessarily. In Danish, just like in English, the present tense can describe:

1. a general habit
2. something that happens in certain situations
3. something happening now, depending on context

Here it most naturally sounds like a general or habitual statement:

• I change gear carefully if the road is slippery.

So it is not mainly about one specific moment, but about what the speaker generally does in that situation.

It is possible for learners to think that way, but Jeg skifter gear forsigtigt is the more natural order here.

Why?

Because gear is the object of the verb, and forsigtigt tells us how the action is done. In neutral Danish, the object often comes before this kind of adverb:

• skifter gear forsigtigt

So the given sentence sounds natural and idiomatic.

Usually carefully is the most direct translation, but cautiously can also fit depending on context.

• forsigtigt often suggests being careful, gentle, or cautious
• in driving contexts, cautiously may sound especially natural in English

So both can work, but carefully is the simplest direct match.