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Estoy seguro de que ella me ama. Es la manera correcta de decirlo, no se debe omitir la preposición "de". Aunque muchas personas suelen decirlo de la otra forma, según la nueva gramática de la lengua española, dice que, obviar la preposición sería un caso de queísmo.

I think the correct phrase is the first one 😊.

Creo que la frase correcta es la primera 😊

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