than做代词的用法.可不可以详细说说呢.

Than
例句：1.Parents had better not give kids more money than is needed.父母最好别给孩子们太多的钱,够用就可以了.
2.Don't order more food than can be finished.别点太多吃的,会吃不完的.
此处Than以主语的形式出现在定语从句中,其实省略了what,than也就等于than what.例句也可以写作：Parents had better not give kids more money than what is needed
例句2则可以转换为：Don't order more food than what can be finished
不管是做介词、连词也好,在定语从句里做关系代词也罢,than都表示了一个比较的关系,从上述两个例句来看,句中都出现了比较级的形式.