>1. Mery sister is eighteen years old.
Merry'S (przynaleznosc) sister is eighteen years old
>2. Their grandfather to make breakfast in the morning.
Nie wiem co chcesz przez to powiedziec
Their grandfather HAVE TO make breakfast in the morning.
Ich dziadek musi rozic rano śniadanie
Their grandfather MAKES breakfast in the morning.
Ich dziadek robi śniadanie rano ( zawsze )