Get a Spanish Tutor
to sift
¡Debían cernir la harina, no sentarse en ella!
You're supposed to sift the flour, not sit in it!
Y si te oigo, lo cierno todo para no oírte.
And if I do listen I sift it so I don't really hear, which is the only way.
No hemos cernido todas las cenizas.
we haven't sifted through all the ashes.