Learn Dutch: Zie je de bergen daar? - Do you see the mountains there?

The singular word for mountain is berg. To make it plural, we just add the regular -en suffix. Because berg ends in two different consonants (r and g), the spelling of the base word doesn't change when we add -en.

Why is the article de used for bergen?

In Dutch, all plural nouns always take the definite article de (meaning "the"). This is true even if the singular version of the word happens to be a het word! (Though in this case, the singular is also de berg).

Why does the sentence say zie je instead of je ziet?

To turn a statement into a yes/no question, Dutch swaps the verb and the subject. So je ziet (you see) becomes zie je (see you?). Also notice that when je or jij comes right after the verb like this, we must drop the -t at the end of the verb.

Should I pronounce the "n" at the end of bergen?

In everyday spoken Dutch, the final -n on plural words ending in -en is usually silent. You will mostly hear native speakers pronounce bergen more like "berg-uh".