Hi! Could someone help me with why the d is in front of etre? Would the sentence still make sense without it there? david est impatient d'être en vacances d'hiver

Hi! Could someone help me with why the d is in front of etre? Would the sentence still make sense without it there?

david est impatient d’être en vacances d’hiver.

The d’ has to be there because it’s part of the expression “être impatient de”. Same as an expression like “avoir besoin de”.

https://www.wordreference.com/fren/être%20impatient%20de

Thanks! Much appreciated.