Questions & Answers about Poika lukee kirjettä huoneessa.
We are learning to add -n to objects for completed actions. Why is the object here kirjettä instead of kirjeen?
Because the action is ongoing, not completed! The partitive case (kirjettä) is used when an action is currently happening ("is reading") or incomplete. If he were to read the whole letter from start to finish (a total completed action), you would use the new -n ending: Poika lukee kirjeen.
How do we get kirjettä from the basic word for letter?
The dictionary form is kirje. For Finnish words that end in -e, the partitive ending is usually -ttä (or -tta, depending on vowel harmony). So, kirje simply gets -ttä added to the end to become kirjettä.
huoneessa means "in the room." Why are there two E's before the -ssa ending?
The basic word for room is huone. Whenever you add most grammatical endings to a Finnish word ending in -e, the rule is to double that final e first. Then you add the "in" ending (-ssa). That gives us huone + e + ssa = huoneessa.
Since lukee can mean "reads" or "is reading," how do we know which translation to use here?