Kennarinn mun láta okkur vita þegar prófið byrjar.

The teacher will let us know when the exam starts.

Breakdown of Kennarinn mun láta okkur vita þegar prófið byrjar.

• byrja: to start
• kennarinn: the teacher
• mun: will
• þegar: when

Questions & Answers about Kennarinn mun láta okkur vita þegar prófið byrjar.

Why does Kennarinn end in -inn?

-inn is the suffixed definite article in Icelandic masculine nominative singular.

• kennari = a teacher (indefinite)
• kennarinn = the teacher (definite)
  So Kennarinn literally means the teacher.

How is the future expressed with mun in Kennarinn mun ...?

mun is a common way to express future or expectation, similar to will in English. The pattern is:

• mun + (infinitive)
  Here: mun láta = will let / will have (someone) do / will cause

Depending on context, mun can sound like a neutral future (will) or a slightly predictive is likely to.

Why isn’t there an að before láta (like “to let”)?

After many auxiliary/modal-type verbs (including mun), Icelandic often uses a bare infinitive (no að):

• Hann mun koma. = He will come.
  Not: Hann mun að koma.

So mun láta is normal without að.

What does láta okkur vita mean grammatically?