Questions & Answers about Muuttuiko mielialasi yhtäkkiä?
Where is the word for "your" in this sentence? Why isn't it "sinun mielialasi"?
This is a perfect example of pronoun drop! Because the word mielialasi already has the 2nd person singular possessive suffix -si attached to it, the genitive pronoun sinun is completely optional. In standard Finnish, it's very common to drop the 1st and 2nd person pronouns (minun, sinun, meidän, teidän) when the possessive suffix is already doing the job.
Why is the verb "muuttua" (muuttuiko) used here instead of "muuttaa" (muuttiko)?
Muuttua and muuttaa both mean "to change", but they work differently. Muuttua is used when something changes by itself (like a mood or the weather), meaning it doesn't take an object. Muuttaa is used when someone changes something else, or when moving house. Since the mood changed on its own, we use the past tense of muuttua (muuttui), plus the question particle -ko.
How exactly is the word "mielialasi" formed?
It is built from the compound noun mieliala (mood, state of mind), which combines mieli (mind) and ala (area, field). Then, the possessive suffix -si (your) is added to the end. Because mieliala ends in a vowel, the suffix attaches directly to the basic form without altering the stem.
Why does "muuttuiko" have to be the first word in the sentence?
In Finnish yes/no questions, the word carrying the question particle -ko or -kö must always be moved to the very front of the sentence. Because we are asking about the action of changing (Did it change?), the verb takes the suffix and jumps to the first position.
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