They must use their sense of hearing to determine where the ball is.
(They; must use; their sense of hearing; to determine where the ball is) Context(They must use,List([0, 13))):(They; must use their sense of hearing to determine; where the ball is) Context(They must use to determine,List([0, 49))):(the ball; is; )
They must use,List([0, 13)) They must use to determine,List([0, 49))
They They the ball
must use must use their sense of hearing to determine is
their sense of hearing to determine where the ball is
where the ball is