Bonsoir
1- Why are you studying English for ?
I'm studying it to travel.
2- Why are you exercising for ?
I'm doing it (exercising) to keep fit.
3- Why are you staying in the beach for?
I'm staying there to get a suntan.
4- Why are you playing with the dog for?
I'm playing with him to make my son laugh.
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Pour la 2- j'ai remplacé"exercising" par doing, car dans l'exemple, on ne reprend pas le complément....
Pour la 4- with "him", si on considère le chien comme un animal de compagnie. Sinon with "it"...
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Bonne fin de soirée