TY  - BOOK
AU  - Perkins,Michael R.
TI  - Modal expressions in English
T2  - Open linguistics series
SN  - 0-86187-298-3
U1  - 425 19
PY  - 1983///
CY  - London
PB  - Pinter
KW  - English language
KW  - Auxiliary verbs
KW  - Modality
KW  - Inglés
KW  - Verbo
KW  - Modismos
N1  - Bibliography: p163-173. - Includes index
ER  -