Pedirle peras al olmo
Get blood out of a stone
Castillos en el aire
Pie in the sky
Mas feliz que una perdiz
Like a dog with two tails
Mas fresco que una lechuga
As cool as a cucumber
Pasarlo bomba
Have a whale of a time
Esta chupado
Easy peasy lemon squeezy
Tener muy poca memoria
To have a memory like a sieve
Me importa un bledo
I don’t give a hoot / I don't care 2 hoots
Un nudo en la garganta
A lump in your throat
Sacar muy buenas notas
Pass with flying colors