Learn Hardcore Finnish: Perheemme tärkein perinne on juhlia syntymäpäiviä yhdessä. - Our family's most important tradition is to celebrate birthdays together.

It’s the possessive suffix for “our.” Instead of saying meidän perheemme, Finnish attaches -mme directly to perhe (“family”) to express “our family.”

Why is tärkein used instead of tärkeä?

tärkein is the superlative form of tärkeä (“important”), meaning “the most important.” In Finnish you form the superlative by adding -in to the adjective stem:
• tärkeä → tärkeä + in → tärkein

Why doesn’t Finnish use articles like “the” or “a” in Perheemme tärkein perinne?

Finnish simply does not have articles. Definiteness or indefiniteness is inferred from context and word order, so you don’t need “the” or “a” in translation.

Why is the verb juhlia in the infinitive rather than a conjugated form like “juhlimme”?

After olla (“to be”), you often use an infinitive as a nominal complement to describe what something is. Here juhlia means “to celebrate,” so the whole clause says “Our family’s most important tradition is to celebrate…”.

Why is it juhlia and not juhlata?

The dictionary (basic) infinitive is juhlata, but when you express the activity in a general or indefinite sense, you use the partitive singular form of that infinitive, which is juhlia.

What case is syntymäpäiviä in, and why is it plural?

syntymäpäiviä is in the partitive plural.
• Partitive is used for objects of verbs that denote ongoing, habitual, or incomplete actions.
• Plural is used because you’re talking about celebrating birthdays multiple times over the years, not just one.

What role does yhdessä play, and could you move it elsewhere in the sentence?

yhdessä is an adverb meaning “together.” Finnish word order is flexible, so you could say, for example,
• “Perheemme tärkein perinne on yhdessä juhlia syntymäpäiviä.”
• “Yhdessä juhlia syntymäpäiviä on perheemme tärkein perinne.”
All mean essentially the same thing, though the emphasis shifts slightly with word placement.

Could you use meidän perheemme instead of perheemme, and is there any difference?

Yes, meidän perheemme also means “our family.” It uses a separate possessive pronoun meidän plus the noun. Finnish often prefers the possessive suffix (perheemme) because it’s more concise, but both forms are grammatically correct.