I know first one is true but I do not understand why? Can anyone explain? thanks in advance.


The verb "gefallen" is used with dative. You can roughly think of it as "to be pleasant to somebody":

Dieses Buch gefällt mir - this book is pleasant to me

Der Schauspieler hat ihr gefallen - the actor was pleasant to her

Hat dir der Film gefallen? - Was the film pleasant to you?

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