Learn Croatian: Vidim dva primjera.

In Croatian, the numbers 2, 3, and 4 follow a special rule: the noun that comes right after them must be in the genitive singular form, not the nominative plural! Since primjer is a masculine noun, its genitive singular adds an -a, making it primjera.

Wait, doesn't the verb vidim (I see) usually require the accusative case?

Yes, it does! Normally, the thing you see takes the accusative form. However, when you use the numbers 2, 3, or 4, the number's grammar rule overrides the verb's rule. The number dva forces the noun into the genitive singular (primjera), regardless of what case the verb originally asked for.

Does the number dva (two) change if the noun is feminine?

Yes. Dva is used for masculine nouns (like primjer) and neuter nouns. If you were counting a feminine noun, you would use dvije instead. For example, 'two women' would be dvije žene.

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

It is hidden inside the verb! The -m ending on vidim tells us that the subject is 'I' (first-person singular). In Croatian, it is completely normal to drop the pronoun ja (I) unless you want to emphasize it, like saying 'Ja vidim dva primjera' (I see two examples [and maybe someone else doesn't]).