Questions & Answers about Ik was in de Alpen aan het skiën.
Why does Alpen get the article de?
Just like in English, mountain ranges in Dutch are plural nouns and always take the definite article de. Because it is plural, if it were the subject of a sentence, the verb would also be plural, as in De Alpen zijn prachtig (The Alps are beautiful).
Why are was and aan het skiën separated by in de Alpen?
This is standard Dutch word order for the continuous aspect. The conjugated verb (was) takes the second position, while the continuous marker (aan het) and the infinitive (skiën) are pushed to the very end of the clause. Any additional information, like the location in de Alpen, gets sandwiched in between.
Why is there a trema (two dots) on the letter 'e' in skiën?
The trema indicates that a new syllable starts there. Without it, the combination ie would be pronounced as a single long vowel sound (like in zien). The dots tell you to pronounce it as two distinct vowel sounds.
Could I just use the simple past and say Ik skiede in de Alpen?
You could, but it changes the nuance. Using the continuous structure was aan het skiën emphasizes that you were in the middle of doing it at that specific moment in the past, matching the English was skiing perfectly. Ik skiede simply states the fact that you skied.