(a)   libros (indef.)

(a)   mano (def.)

(a)   clases ((indef.)

--- computador (indef.)

(a)  

(a)   profesora (def.)

(a)   sala de clases (def.)

(a)   manos (indef.)

(a)   año (def.)

(a)   día (indef.)

(a)   semana (def.)

(a)   noche (def.)

(a)   estación (season.. remember?) (def.)

(a)   verano (indef.)

(a)   pie (def.)