Learn Finnish: Pakkausta ei hyväksytä tehtaassa. - The package is not accepted in the factory.

To form the negative present passive, you take the affirmative passive and drop the final -an or -än. The affirmative passive for is accepted is hyväksytään. Dropping the -än leaves the passive stem hyväksytä. Add the negative word ei in front, and you get ei hyväksytä.

Why is the word for package in the partitive case (pakkausta)?

In Finnish, the object of a negative sentence is always in the partitive case. Because the package is not being accepted, the basic word pakkaus takes the partitive ending -ta to become pakkausta.

The dictionary form for factory is tehdas. How does it become tehtaassa?

Tehdas belongs to a group of words ending in -as. When adding an ending like the in-case ending -ssa, two things happen: the -as changes to -aa-, and the consonants undergo reverse consonant gradation (hd changes to the strong grade ht). This gives us the stem tehtaa-, making the final word tehtaassa.

What is the basic verb form of hyväksytä?