Learn Danish: Hundene løber i markerne. - The dogs run in the fields.

To make a noun definite plural (meaning "the" plural), you start with its regular plural form and add -ne. The singular is hund, the plural is hunde, and adding -ne gives us hundene (the dogs).

Why does markerne have an "r" before the -ne ending, but hundene does not?

It depends entirely on the word's regular plural form. The plural of mark (field) is marker. When we add the definite suffix -ne to it, we get markerne (the fields). Because the plural of hund is just hunde, adding -ne to it gives us hundene.

Could løber also translate to "are running"?

Yes! Danish does not have a continuous tense (like the English "are running"). The present tense verb løber covers both "run" and "are running", depending on the context.

Is the "d" in hundene pronounced?

No, the "d" in hund, hunde, and hundene is silent. This is very common in Danish when a "d" comes immediately after an "n".