1.no longer中的longer是副词long的比较级,long有after a certain point of time(在某一时刻以后)之意,着重表示时间的不再延续,意为“如今不再”.no longer等于not...any longer.
2.no longer / not...any longer表示不再继续或再现过去某一时刻发生或存在而一直延续的动作 / 状态时,常用于过去时、现在时或将来时的句子中.如：
He was no longer a thief.他不再是小偷了.
When there is no gravity,our feet no longer stay on the ground.如果没有重力,我们的脚就不能再站稳在地面上.
3.当修饰动词时,no longer通常置于be或行为动词前；not...any longer常置于句末.
4.no longer / not...any longer 习惯用来修饰表示状态的持续动词(如wait,live,work等).如：
Don't wait any longer.别再等了.
She could not keep up with him any longer.她不能再赶上他了.