Questions & Answers about Pieni poika ostaa kaksi karkkia.
Why is the word for candies (karkkia) in the partitive form here?
This is a golden rule in Finnish: whenever you use a number greater than one (like kaksi), the noun that directly follows it must be in the partitive singular form.
Is karkkia a plural word since the English translation says "candies"?
Why does the verb ostaa have a double 'a' at the end?
The verb is matching the subject, poika (boy), which is a "he" (3rd person singular). For most verbs at this level, you create the "he/she/it" form by taking the verb stem (osta-) and doubling the last vowel. That makes it ostaa.
If the boy bought ten candies instead, would the grammar change?
Not at all! The rule applies to all numbers from two upwards. "Ten candies" would be kymmenen karkkia, "fifty candies" would be viisikymmentä karkkia, and the rest of the sentence remains exactly the same.