@book{Szymański:2019,
author
=
"L.Szymański",
title
=
"Modal auxiliaries and aspect in contemporary American English - a corpus-based study, ISBN: 9788378423713",
publisher
=
"Oficyna Wydawnicza Uniwerstetu Zielonogórskiego",
address
=
"Zielona Góra",
year
=
"2019",
pages
=
"211",
}