Notes from ¿Qué tal? - Summary of the Uses of Ser

To identify people and things. (Ella es doctora.)
To express nationality; with de to express origin. (Son cubanos. Son de la Habana.)
With de to tell of what material something is made. (El suéter es de lana.)
With para to tell for whom something is intended. (El regalo es para Sara.)
To tell time. (Son las once. Es Ia una y media.)
With de to express possession. (Es el libro de Carlota.)
With adjectives that describe basic, inherent characteristics. (Ramona es inteligente.)
To form many generalizations. (Es necesarlo llegar temprano. Es importante estudiar.)