请问同样是表示不用谢,Think nothing of it 与Not worth thanking 有什么区别

请问同样是表示不用谢,Think nothing of it 与Not worth thanking 有什么区别 not worth thanking 与 Think nothing of it 是否一样 think 与think of 有什么区别 think of 与think about 有什么区别? worth,worthy 与 worthwhile有什么区别? 请问:nothing but与anything but有什么区别? think nothing of it.急 worth 与worthy的区别?主要是project前为何用worthy不用worth! think nothing of it 用在什么场合 it is worth nothing "sth.be worth doing"与"sth.be worthy of being done"有什么区别?为什么一 think of 与think about 与think有什么区别,怎么有的时候可以随意用的?