Ég get hreyft fingurinn, en ökklinn er ekki eins góður og hann var í gær.

After geta meaning can / be able to, Icelandic normally uses the supine form of the next verb. That is why you get hreyft here, not the dictionary infinitive hreyfa.

So:

• að hreyfa = to move
• ég get hreyft = I can move

This is a very common pattern, and you will see it with many verbs after geta.

Here hreyfa means to move something, not just to move in general.

That matters because Icelandic often distinguishes:

• hreyfa = move something
• hreyfast = move, be moving, budge

So Ég get hreyft fingurinn means I can move the finger, while Fingurinn hreyfist would mean the finger is moving / moves.

The -inn is the suffixed definite article, so it means the.

• fingur = finger

• fingurinn = the finger

• ökkull = ankle
• ökklinn = the ankle

Icelandic usually attaches the to the end of the noun instead of writing it as a separate word.

With body parts, Icelandic often uses the definite form when the owner is obvious from context. So fingurinn can naturally mean my finger, and ökklinn can naturally mean my ankle, even without minn.

English usually prefers a possessive in these situations, but Icelandic often does not need one.

It is the direct object of hreyft, so grammatically it is in the accusative.

In this noun, the nominative and accusative singular definite happen to look the same: fingurinn. So even though you cannot see a difference in the form here, the function in the sentence is still accusative because it is the thing being moved.

Góður agrees with ökklinn, which is masculine singular nominative and is the subject of the clause.

So the adjective appears in the matching form:

• ökklinn er góður

If the noun were different in gender, number, or case, the adjective form would also change.

It means not as good as.

The pattern is:

• eins + adjective + og

So:

• eins góður og = as good as
• ekki eins góður og = not as good as

This is a very common Icelandic comparison pattern.

Because in Icelandic the comparison pattern is eins ... og.

Even though og usually means and, after eins it is part of the structure meaning as ... as.

So you should learn eins ... og as one unit:

• eins stór og = as big as
• eins góður og = as good as

Here góður means something like okay, in good condition, or doing well, not good in a moral sense.

With health, injuries, and body parts, Icelandic often uses góður this way. So ökklinn er ekki eins góður means the ankle is not doing as well or not in as good a condition.

Hann refers to ökklinn.

Since ökkull is a masculine noun, Icelandic uses the masculine pronoun hann to refer back to it. Icelandic does this even with things that are not people, because grammatical gender matters.

So:

• ökklinn = masculine
• hann = he / it for a masculine noun

Var is the past tense singular form of vera, which means to be.

So:

• er = is
• var = was

In hann var í gær, it means it was yesterday.

Í gær means yesterday.

Even though í often means in or into, in this expression you should really learn í gær as a fixed time phrase. It is just the normal Icelandic way to say yesterday.

In a main clause, Icelandic normally puts the finite verb in the second position. That gives you:

• Ökklinn er ...

Then ekki usually comes after the finite verb:

• Ökklinn er ekki ...

So the order here is very natural Icelandic word order.

Yes. In this sentence, en means but and connects the two clauses:

• Ég get hreyft fingurinn
• en ökklinn er ekki eins góður...

One useful extra point: en can also mean than after comparatives, such as betri en = better than. But here it clearly means but.