skifahren
to ski
To move over snow on skis, as a sport or leisure activity.
Im Winter fahren wir jedes Wochenende in den Alpen skifahren.
In winter, we go skiing in the Alps every weekend.

to ski
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to ski
To move over snow on skis, as a sport or leisure activity.
Im Winter fahren wir jedes Wochenende in den Alpen skifahren.
In winter, we go skiing in the Alps every weekend.

The verb is made up of 'Ski' (ski) and 'fahren' (to drive/go). In a main clause, it is separated, and 'Ski' is capitalized as a noun.
Am Wochenende fahre ich mit Freunden Ski.
On the weekend, I go skiing with friends.
Since 'skifahren' (to ski) describes movement, the perfect tense is always formed with the auxiliary verb 'sein' (to be). The form is 'Ski gefahren sein' (to have gone skiing).
Letzten Winter sind wir in Österreich Ski gefahren.
Last winter, we went skiing in Austria.
When 'skifahren' (to ski) is used in the infinitive, it is often combined with another verb such as 'gehen' (to go), 'lernen' (to learn), or 'können' (to be able to), and it is written as one word.
Kannst du gut skifahren?
Can you ski well?