Ef gáttin opnaðist, myndu geimverurnar eyðileggja reikistjörnuna.

Questions & Answers about Ef gáttin opnaðist, myndu geimverurnar eyðileggja reikistjörnuna.

Why does opnaðist end in -st, and what grammatical form is it here?
It has the -st ending because it is the middle voice of opna (to open), used here because the portal is opening on its own rather than being opened by someone. Because this is a hypothetical 'if' scenario, it is technically in the past subjunctive form. For this specific verb, the past subjunctive looks exactly the same as the regular past tense (opnaðist).
Why does myndu come before geimverurnar?
Because of the V2 (verb-second) rule. The entire if-clause (Ef gáttin opnaðist) counts as the first piece of information in the sentence. Therefore, the main verb of the result clause, myndu (would), must come right after the comma to take the second slot, followed by the subject geimverurnar.
How is the word geimverurnar (the aliens) built?
It is a compound of geimur (space) and vera (being). Here it is in the plural nominative form because the aliens are the subject of the main clause, and it has the plural definite article -nar attached to the end to mean 'the space beings'.
Why does reikistjörnuna end in -na?
The base word is reikistjarna (planet, literally 'wandering star'). Because it is the direct object being destroyed, it takes the accusative case, changing the final -a to -u (reikistjörnu). The -na is the accusative feminine definite article attached to the end, making it 'the planet'.

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