When expressing the idea of playing a musical instrument, French uses jouer de plus the definite article (le, la, les):
Elle joue très bien du piano
She plays the piano very well
J’aimerais bien apprendre à jouer de la guitare
I’d really like to learn to play the guitar
When expressing the idea of playing a sport or game, French uses jouer à plus the definite article :
Les enfants jouaient au badminton dans le jardin
The children were playing badminton in the garden
A la fin des cours les élèves jouent au football
At the end of lessons the schoolchildren play football
This means that when referring back to an instrument or sport using it, you should use the pronouns en or y and not le or la:
Le piano? Je ne sais pas en jouer
The piano? I don't know how to play it
Le badminton? Nous aimons bien y jouer
Badminton? We really like playing it
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