Learn Icelandic: Hér eru tveir bílar.

In Icelandic, the numbers 1, 2, 3, and 4 change to match the gender of the noun they are counting. Since bíll (car) is a masculine noun, we use the masculine form of two, which is tveir. For a feminine noun it would be tvær, and for neuter, tvö.

How is the plural bílar formed from the singular word for car?

The singular word is bíll. To make many masculine words plural, you add -ar to the end. Notice that bíll ends in a double -ll, but it drops one l when the -ar ending is added, becoming bílar.

Why does the verb eru come before the subject tveir bílar?

This is due to the "verb-second" rule in Icelandic. In a normal statement, the main verb is always the second piece of information. Because the sentence starts with the location word Hér (Here), the verb eru (are) steps into the second slot, pushing the subject tveir bílar (two cars) after it.

Which verb does eru come from?