Breakdown of Tämä on lukusali. Älä melua täällä.
tämä
this
olla
to be
täällä
here
älä
don't (negative imperative)
Questions & Answers about Tämä on lukusali. Älä melua täällä.
How is the negative command älä melua formed?
It starts with älä, which is the word for "do not!" when speaking to one person. The verb is meluta (to make noise, a type 4 verb). To get the form that follows älä, you take the "I" form (minä meluan) and drop the final -n, leaving you with melua.
I looked up melua and it said it's the partitive form of the noun melu (noise). Is it a noun or a verb here?
It is a verb here, but you are right that it looks exactly like the noun! Because it comes right after the command word älä, we know it has to be a verb. While melua can mean "some noise" (noun), in this sentence it is the command form of the verb meluta (to make noise).
What are the parts of the compound word lukusali?
It is made of luku (reading) and sali (hall or large room). The word luku comes from the verb lukea (to read), though on its own, luku can also mean a "chapter" or a "number".
Why use täällä instead of tänne for "here"?
In Finnish, the word for "here" changes depending on movement. Täällä is used when something is happening at a location without moving away or arriving. Since the sentence is talking about making noise in this specific, static spot, we use täällä. If you were saying "Come here!" (movement towards), you would use tänne.