feel bad和feel badly 哪个对?feel到底是系动词还是普通动词？副词不是可以修饰动词吗？

feel terrible.和 feel bad.的区别 feel bad和feel badly 哪个对?feel到底是系动词还是普通动词？副词不是可以修饰动词吗？ feel badly ill中badly的用法 I feel bad feel bad about sth. feel feel feel feel feel feel feel feel I feel bad very much feel good和feel well feel ill,feel sick,feel terrible 可以,但feel bad可以吗? bad 和badly 是什么词性? they begin to feel bad.为什么要用to 还有begin和feel哪个是谓语谢谢