TY  - GEN
AU  - Azar, Betty Schrampfer,
AU  - Hagen, Stacy A.
TI  - Understanding and using English grammar: with answer key 
SN  - 0132464500
AV  - PE 
PY  - 2009///
CY  - White Plains, N.Y.
PB  - Longman
KW  - English language
KW  - Grammar
KW  - Study and teaching
KW  - Foreign speakers
N1  - International edition-Not for sale in the U.S.A
ER  -