Question 1

Why do ahkera and opiskelija both take the -sta ending here?

Accepted Answer

This is the core of the transformation construction you are learning. When someone becomes something using the verb tulla, the person who is changing is put into the elative case (-sta or -stä). It helps to think of it literally as 'Out of the hardworking student came a practical nurse.' Note that the adjective ahkera must agree with the noun and take the same ending.

Question 2

If the student is the one who became a nurse, why doesn't the verb agree with a normal subject?

Accepted Answer

In this specific structure, the verb tulla is always locked into the third-person singular form (here, the past tense tuli). Because the person changing is in the elative case (opiskelijasta), they are not the grammatical subject of the sentence, so the verb defaults to the basic third-person form regardless of who is changing.

Question 3

I learned earlier that changing into a profession uses the translative case (-ksi). Why is lähihoitaja in the basic nominative form here?

Accepted Answer

You are remembering correctly for other verbs of change! Verbs like valmistua (to graduate) or opiskella (to study to be) do use the translative case, as in valmistuin lähihoitajaksi. However, this specific tulla construction has its own strict rule: the end result must always be in the nominative (basic) case.

Question 4

How would this sentence change if I wanted to say 'I became a hardworking student'?

Accepted Answer

You would put the word for 'I' into the elative case (minusta), keep the verb exactly the same (tuli), and put the end result in the nominative. The sentence would be: Minusta tuli ahkera opiskelija.

Ahkerasta opiskelijasta tuli lähihoitaja.

Breakdown of Ahkerasta opiskelijasta tuli lähihoitaja.

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