fast: 侧重于指人或物体具有运动速度快的特点, run fast, quickly: 侧重指某事完成或发生的快 answer the question quickly
majority: 只能修饰可数名词, the majority of people most: 可数不可数均可
most: 用于表感受的肯定句中,相当于very,当大部分,大多数解时是形容词或名词, most people, mostly: 大部分,是副词 the people are mostly…