elt.oup.com/student/project/level1/unit06/grammar/exercise1?cc=cz&selLanguage=cs
agendaweb.org/exercises/verbs/be-or-have/be-have-2.htm
www.liveworksheets.com/worksheets/en/English_as_a_Second_Language_(ESL)/Verb_to_be/To_be_or_to_have_got$_bm5624qa
www.liveworksheets.com/worksheets/en/English_as_a_Second_Language_(ESL)/To_be_or_to_have/To_be_or_to_have_kd86pt