I don't think 'dont ' and 'duquel' are always interchangeable.
In the examples given in the lesson , the verbs all use de :
avoir envie de , avoir peur de, parler de, avoir besoin de ...
In thoses cases you can use any of the possibilities suggested .
Hope this helps!
The distinction is a pretty complicated matter and depends also on the register you are using. Here is a page which explains it and also offers a little test in the end to check your understanding: https://www.francaisfacile.com/exercices/exercice-francais-2/exercice-francais-105504.php
-- Chris (not a native speaker)
I don't see them as interchangeably equivalent. They serve a similar purpose but in some instances you need one where you can't substitute the other. I believe the site to which I postet the link in my previous post explains it pretty well.
-- Chris (not a native speaker).
It would be nice to be able to refer to a list of verbs that use prepositions.
It is in my To-Do list....
Here's one! Not exhaustive of course, but has a lot of verbs.
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