sentence: People are pulled up a hill on a tug rope sitting on inter tubes. sentence:  A family pulls their inter tubes along by hand and the top of the hill. sentence:  A person sits in an inter tube at the top of a hill then rides down the slope laughing. sentence:  The family straps together the inter tubes in a circular grouping with the kids sitting in them. sentence:  The family rides in a large grouping of inter tubes down a snowy slope.