Breakdown of Laulajan pitää laulaa todella hyvin.
laulaa
to sing
hyvin
well
pitää
must / have to
todella
really (very, intensifier)
Questions & Answers about Laulajan pitää laulaa todella hyvin.
How do we form the actor noun laulaja in this sentence?
You take the verb laulaa (to sing), find its strong vowel stem laula-, and add the actor suffix -ja. This works just like the English suffix '-er' to turn an action into the person doing it (sing into singer).
Why is the singer in the genitive case (laulajan) instead of the basic nominative (laulaja)?
This is required by the verb pitää (to have to). In Finnish necessity sentences, the subject (the person who has to do something) must always be in the genitive case.
Why doesn't the second verb (laulaa) conjugate to match the singer?
In necessity structures using verbs like pitää or täytyy, the main verb stays in the third-person singular, and the action being done always stays in its basic dictionary form (the first infinitive).
Why does the sentence use hyvin instead of hyvä?
Because it describes how the singing is done, we need the adverb form 'well' instead of the adjective 'good'. While most Finnish adverbs are formed by adding -sti to the stem, hyvä is an important irregular exception that becomes hyvin.