Jeg behøver ikke at tage bussen, hvis vejret er godt nok til at cykle.

Because in a normal Danish main clause, the finite verb usually comes in second position. So the order is:

Jeg + behøver + ikke

This is very common in Danish:

• Jeg kommer ikke i morgen.
• Hun spiser ikke kød.

So ikke usually comes after the finite verb in a main clause.

Not quite. Behøver means need (to), so Jeg behøver ikke... means I do not need to...

That is different from must not, which means something is forbidden.

So:

• Jeg behøver ikke at tage bussen = I don’t need to take the bus
• Jeg må ikke tage bussen = I’m not allowed to take the bus

That distinction is very important.

Because after behøver, Danish often uses an infinitive with at:

• Jeg behøver at gå
• Du behøver ikke at vente

So at tage means to take.

In spoken Danish, people sometimes leave out at, especially in casual speech, but behøver ikke at tage is very normal and standard.

Because Danish usually attaches the definite article to the end of the noun.

So:

• en bus = a bus
• bussen = the bus

In this sentence, Danish uses the bus where English often says the bus too, so the match is straightforward.

Yes. Hvis means if and introduces a condition:

• Hvis vejret er godt nok... = If the weather is good enough...

It is used for conditional statements, just like English if.

Because vejret is the definite form of vejr:

• vejr = weather
• vejret = the weather

Danish often uses the definite form in places where English also says the weather:

• Vejret er godt i dag. = The weather is good today.

So hvis vejret er godt nok is literally if the weather is good enough.

Because vejr is a neuter noun in Danish: et vejr.

When an adjective describes a singular neuter noun, it usually takes -t:

• god for common gender
• godt for neuter

So:

• en god dag
• et godt vejr

That is why we get vejret er godt nok.

Also, nok here means enough, so godt nok means good enough.

Not always. It can mean different things depending on context.

In this sentence, godt nok til at cykle clearly means good enough to cycle.

But in other contexts, godt nok can also mean something like:

• indeed
• admittedly
• really

For example:

• Det er godt nok dyrt. = That’s really expensive.

So here the structure adjective + nok + til at... is what tells you it means enough to...

Because nok til at... is the normal pattern for enough to...

So:

• god nok til at gøre det = good enough to do it
• stærk nok til at løfte den = strong enough to lift it
• godt nok til at cykle = good enough to cycle

This is a very useful structure to learn: adjective + nok + til at + infinitive

The subject is understood from the context. In English we also often do this:

• The weather is good enough to cycle
• The coffee is too hot to drink

Danish works the same way here. The sentence means the weather is good enough for the speaker to be able to cycle, even though jeg is not repeated.

So til at cykle is just an infinitive phrase, and the subject is implied.

It means both. At cykle is the normal Danish verb for to cycle / to ride a bike.

Examples:

• Jeg cykler til arbejde. = I cycle / bike to work.
• Hun kan godt lide at cykle. = She likes cycling / riding a bike.

So in natural English, you could translate it either way depending on style.

You could, but it would usually mean something different.

• Jeg behøver ikke at tage bussen = I don’t need to take the bus
• Jeg skal ikke tage bussen = often I’m not going to take the bus or I’m not supposed to take the bus

So behøver ikke expresses lack of necessity, while skal ikke often expresses plan, expectation, or instruction.

That is why behøver ikke is the best choice here.

Then Danish uses normal verb-second order in the main clause, so the subject and verb switch compared with the English pattern.

Original:

• Jeg behøver ikke at tage bussen, hvis vejret er godt nok til at cykle.

With the hvis-clause first:

• Hvis vejret er godt nok til at cykle, behøver jeg ikke at tage bussen.

Notice:

• not Hvis ..., jeg behøver ikke...
• but Hvis ..., behøver jeg ikke...

This is a very important Danish word-order rule.