worthwhile: 值得的(可作定语和表语)。如：That is a worthwhile program.(那是一个值得听的节目。)So few movies are worthwhile nowadays.(当今有价值的电影很少。)
worthless: 无价值的，无用的(可作定语和表语，无比较级)。如：These stamps are worthless.(这些邮票无价值。)Don’t read worthless books.(不要读些没用的书。)
worth: 值……钱，值得……的。如：This house is worth a lot of money.(这房值很多钱。)The radio program is worth listening to. (这广播节目值得听。)
worthy: (1)有价值的，可尊敬的(常作定语)。如：The teacher was a worthy man.(那位老师是可尊敬的人。)(2)值得的(常作表语)。如：The man is worthy of praise.(这人值得称赞。)它的动词句式是be worthy to be done (be worth doing).
worthy be ~ of: 够得上，值得
worthwhile: 值得花时间的，值得做的
worth be ~ sth/doing: 值得
worthless: 无价值的