Learn Croatian: Mogu jesti krišku torte. - I can eat a slice of cake.

The base word is torta, which is a feminine noun. We need to say "of cake" because it follows a quantity (a slice). This requires the genitive case. For feminine nouns ending in -a, the genitive singular ending changes to -e, making it torte.

Why does "kriška" (slice) change to "krišku" in this sentence?

The slice is the direct object of the sentence because it is the thing being eaten. This means it must be in the accusative case. Feminine nouns that end in -a change their ending to -u in the accusative, so kriška becomes krišku.

Where is the word for "I" in this sentence?

In Croatian, you usually drop subject pronouns like ja (I) because the verb form already shows who is acting. The verb mogu means "I can", so the extra pronoun isn't needed.

Why is the verb "jesti" (to eat) used in its dictionary form?

When you use a helping verb like mogu (I can), the second verb is always in the infinitive (the dictionary form). This works exactly like English, where we say "I can eat" rather than "I can eats".