Ef ökklinn minn verður ekki betri á morgun, fer ég til læknis.

Because Icelandic main clauses normally follow the verb-second rule.

In this sentence, the whole ef-clause comes first:

Ef ökklinn minn verður ekki betri á morgun

That entire clause counts as the first element, so in the main clause the finite verb comes next:

fer ég til læknis

If you started with the main clause instead, you would say:

Ég fer til læknis ef ökklinn minn verður ekki betri á morgun.

So both are correct, but the word order changes because of Icelandic sentence structure.

In Icelandic, possessives are very often placed after the noun:

• bíllinn minn = my car
• húsið mitt = my house
• ökklinn minn = my ankle

This is especially common with body parts, where Icelandic often uses:

definite noun + possessive

So ökklinn minn is the natural, everyday way to say my ankle here.

The ending -inn is the definite article attached to the noun.

• ökkli = ankle
• ökklinn = the ankle

Unlike English, Icelandic usually adds the to the end of the noun.

So literally, ökklinn minn is something like the ankle of mine, but in normal English we just say my ankle.

With body parts, Icelandic very often keeps this definite form even when a possessive is also present.

Verður is from verða, which means become or get.

So:

verður ekki betri = doesn’t get better

That fits the idea of recovery or improvement over time.

If you used er, the meaning would be more like:

is not better

That is possible in some contexts, but here Icelandic naturally prefers verður because the sentence is about whether the ankle improves by tomorrow.

Yes. Icelandic often uses the present tense to talk about the future when the time is clear from context.

Here, á morgun already tells you the time is future, so Icelandic does not need a separate future form.

So:

• verður = present form, but future meaning here
• fer = present form, but future meaning here

This is very common in Icelandic.

Because betri is an adjective agreeing with ökklinn, which is masculine singular.

• betri = better, masculine/feminine singular in this kind of use
• betra = better, neuter singular
• betur = better, but as an adverb

So:

• Ökklinn minn verður ekki betri = My ankle doesn’t get better
• Ég sef betur = I sleep better

A useful shortcut:

• use betri/betra for nouns
• use betur for verbs

Because ekki usually comes after the finite verb and before what is being negated.

Here the structure is:

verður ekki betri

That means:

does not become better

So ekki is negating the idea of becoming better.

This placement is very normal in Icelandic:

• Hann er ekki heima = He is not at home
• Ég kem ekki á morgun = I am not coming tomorrow

Because the preposition til takes the genitive case.

The basic noun is:

læknir = doctor

Its genitive singular form is:

læknis

So:

til læknis = to a doctor / to the doctor

Also, fara til læknis is a very common Icelandic expression meaning go to the doctor or see a doctor.

The definite article is often not used in this kind of phrase, because the meaning is more general: getting medical help, not necessarily visiting one specific previously mentioned doctor.

Yes.

You can say:

Ef ökklinn minn verður ekki betri á morgun, þá fer ég til læknis.

Here þá means then.

It is optional:

• without þá: completely natural
• with þá: a little more explicit, like If ..., then ...

Both versions are correct.

Because the sentence starts with a subordinate if-clause, and Icelandic normally separates that from the main clause with a comma in writing.

So this pattern is standard:

Ef ..., fer ég ...

The comma helps show where the condition ends and the main statement begins.