He feels differently.这里的feel 为实义动词,实义动词后接副词
区分feel 何时是实义动词,何时是系动词一个窍门,看feel能否被be动词替代.
例如,I feel happy可说成I am happy,这时的feel就是系动词.
而Grace feels differently,不能说成Grace is differently,则feel是实义动词.
系动词feel作谓语,后面接的形容词是表语,又叫主语补语,是补充说明主语的情况；而实义动词feel作谓语,后面接的副词是状语,是修饰说明谓语的情况.