Количество градусов, которое составляет дуга меридиана от экватора до Северного полюса

Did you hear
me translating their conversation?
her leave the room?
us enter the room?
us answering the teacher's questions?
them banging on the door?
her playing the piano?them discussing the matter?
her trying to close the window?
your swimming?
your cross the river and come back?
a stranger disappearing behind the corner?