TY  - BOOK
AU  - Thomson,A.J.
TI  - A practical english grammar: exercise 
SN  - 0194313533 v.1
U1  - 421 
PY  - 1994///
CY  - New York
PB  - Oxford University Press
KW  - Ingles
KW  - Enseñanza
N1  - v.1: Articles.--Auxiliary verbs.--Present and past tenses.--Future forms.--Conditional.--Infinitive.--Gerund, infinitive and participles.--Gerund, infinitive and participles.--Passive.--Indirect speech.--Purpose.--Key
ER  -