In lesson 1.14 Telling Time
They use
Es cuarto para las cuatro to tell 3:45, but
Son cinco para las tres to tell 2.55
When do you use "es" and when to use "son"?
When to use son or es in telling time

Esther-L
January 18, 2011

Tara-M
January 21, 2011
Es is for anything that starts with "un cuarto" and for 1:00 ("es la una").
Son is for everything else.

Esther-L
January 25, 2011
Muchas Gracias!