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Questions & Answers about Opettaja pitää historiasta.
Why does the word for history have the -sta ending (historiasta)?
The verb pitää (to like) requires the thing being liked to be in the elative case. In English, you say "likes history", but in Finnish grammar, it works a bit like saying "likes from history". That is why historia becomes historiasta.
Could I use tykätä instead of pitää in this sentence?
Yes! You could say Opettaja tykkää historiasta. Both verbs mean "to like" and both require the exact same elative case ending (-sta / -stä). Tykätä is just a bit more casual and very common in spoken Finnish, while pitää is standard written Finnish (though also used in speech).
I remember learning that pitää means "must" or "have to". How do I know it means "likes" here?
You can tell by looking at the word endings! When pitää means "to like", the person who likes is in the basic nominative form (opettaja) and the thing they like gets the -sta / -stä ending (historiasta). When pitää means "must", the person who must do something is in the genitive case (like opettajan) and it is followed by an action verb (like Opettajan pitää lukea - The teacher has to read).
Does the -ja ending in opettaja work like the "-er" ending in English?