Learn Finnish: Kolmantena tammikuuta minusta tulee lähihoitaja. - On the third of January, I will become a practical nurse.

This is the Finnish way to express becoming something. Instead of saying 'I become a nurse', Finnish literally says 'Out of me comes a nurse'. The person who is transforming takes the elative case, which is why we use minusta.

Since I am the one becoming a nurse, why is the verb tulee instead of tulen?

In this specific construction, the word minusta is not the grammatical subject, so the verb does not match it. The verb tulla is always in the third-person singular form (tulee, tuli, etc.) when used in this transformation structure.

Why is the new profession, lähihoitaja, in the basic nominative case?

In the tulla transformation structure, the result of the change (the practical nurse) actually acts as the grammatical subject of the sentence. Therefore, it stays in the basic nominative form.

How does the date phrase kolmantena tammikuuta work grammatically?

To say 'on a specific date', Finnish puts the ordinal number in the essive case, which often expresses a time when something happens. Kolmas (third) becomes kolmantena (on the third). The month itself is in the partitive case (tammikuuta), meaning 'of January'.