TO BE (být)
PROCVIČOVÁNÍ:
elt.oup.com/student/project3rdedition/level1/unit2/grammar/exercise4?cc=cz&selLanguage=cs
elt.oup.com/student/project3rdedition/level1/unit2/grammar/exercise2?cc=cz&selLanguage=cs
elt.oup.com/student/project3rdedition/level1/unit2/grammar/exercise1?cc=cz&selLanguage=cs