Becoming: -ks, -na

-ks (result / period / purpose): arstiks saama (to become a doctor), nädalaks (for a week), kingituseks (as a gift), õhtuks (by evening).

-na (in the role of, as): õpetajana töötama (to work as a teacher), lapsena (as a child).

Both endings attach to the genitive: kokk → koka → kokaks / kokana.

A change of state also takes -ks: Ilm läheb külmemaks (it is getting colder), Ta jäi haigeks (he fell ill).