Because the verb in French is 'penser à '.
I've been meaning to ask but please let me know if Lawless French or KwizIQ has a lesson that lists many of the verbs that require à? It is not always obvious to me as a student. Many thanks.
here's a good list that i've found
when you say "think about sb" in french, it is "penser à qn"
hence why it is a qui, not de qui
Here are a couple of lists of verbs which are followed by à and an indirect object -
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