they have never seen the ocean. they must see it.
they have never walked in the desert. they must walk in the desert.
they have never spent time in the sun. they must spend time in the sun.
they have never spoken to people from australia. they must speak to people from australia.
they have never watched koalas. they must watch koalas.
they have never jumped with kangaroos. the must jump with kangaroos.
they have never thrown a boomerang. they must throw a boomerang.