Learn Swedish: Vänskapen är viktig för oss. - The friendship is important to us.

It is made by taking the root noun vän (friend) and adding the suffix -skap. This works exactly like the English suffix "-ship", turning a noun into an abstract state or relationship (vän becomes vänskap).

Why does this sentence use vänskapen instead of vänskapet?

Nouns formed with the suffix -skap can be either en or ett words. A great rule of thumb: if the word describes an abstract state or quality (like vänskap for friendship, or kunskap for knowledge), it is almost always an en word. If it describes a collective group or a physical area (like sällskap for company, or landskap for landscape), it is usually an ett word. Because vänskap is an en word, its definite form is vänskapen.

Does the adjective viktig change depending on the -skap word it describes?

Yes! Adjectives must agree with the gender of the noun. Since vänskapen is an en word, we use the base form viktig. If the sentence were about an ett word like sällskapet (the company), you would have to add a -t and say Sällskapet är viktigt.

The translation says "important to us", so why does the Swedish sentence use för instead of till?