TY  - BOOK
AU  - Azar, Betty Schrampfer;  Hagen, Stacy A.
TI  - Basic english grammar / Betty Schrampfer Azar; Stacy A. Hagen
SN  - 978-0-13-240966-7
U1  - 428 A992 
CY  - Estados Unidos de América: PEARSON
KW  - 1. OBRAS GENERALES 2. GRAMMAR-ENGLISH
N1  - Using BE and HAVE; using the simple present, progressive; talking about the present
ER  -