Breakdown of Ég skal skrifa uppkastið á morgun.
ég
I
skrifa
to write
á morgun
tomorrow
skulu
to shall / to promise to
Questions & Answers about Ég skal skrifa uppkastið á morgun.
I usually use ég ætla að to say what I will do. How does ég skal change the meaning here?
Using skulu (here as skal) makes this a firm promise or a strong offer, rather than just stating a future plan. While ég ætla að skrifa means "I am going to write" or "I intend to write", ég skal skrifa translates better to "I promise to write" or "I shall write".
Why is there no að before the verb skrifa?
Skulu is a modal verb, and just like vilja (to want) and mega (to be allowed to), it is followed directly by the bare infinitive of the main verb. So you say ég skal skrifa, not ég skal að skrifa.
What case is uppkastið in, and why?
It is in the accusative case because it is the direct object receiving the action of the verb skrifa. The base word is the neuter noun uppkast (draft). Neuter nouns have the exact same form in both the nominative and accusative cases, so adding the definite article gives us uppkastið (the draft) for both.
The word morgun means morning. Why is it used here for tomorrow?
The fixed phrase á morgun literally translates to "on morning", but in Icelandic, it is the standard, everyday way to say "tomorrow".