TY  - BOOK
AU  - Azar, Betty
TI  - Basic English Grammar : Teacher ́s
SN  - 0133683257
U1  - 428.5 A992b 
PY  - 1997///
CY  - Estados Unidos
PB  - Prentice Hall 
KW  - USING BE AND HAVE
KW  - EXPRESSING PRESENT TIME
KW  - NOUNS AND PRONOUNS
ER  -