In order to produce a fully corporeal Patronus, one must concentrate on an extremely happy memory.
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Harry produced his when he remembered how happy he was to finally be leaving the Dursley's for Hogwarts.
Maybe you'd conjure your Patronus with your memory of when you first learned to ride a bike or drive a car.
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For example, one of my happiest memories was graduating from college with my best friends.
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It was such an emotional moment, but the overall feeling was utter joy.
Whatever the memory is, just let us know below!
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