French language Q&A Forum

I wrote "faire du ski." I think this is form give elsewhere on Lawless French.  Here the correct answer is given as "faire de ski."   Which is correct?

Hello,

I learnt in another lesson that after "Quand" usually + Futur simple (Quand/pendant que + future tense (Le Futur Simple) - not the present tense = When/while I do something in the future (Sequence of Tenses in French) ), but in this lesson it is + Futur Antérieur. So how do you know when to + which tense?

Or are there cases where they can be used interchangeably?

Thank you.