too many.just list a few for you.
(1)---ness 名词性标志
happy---happiness,care---careness
(2)---less 构成否定性形容词
care---careless;friend---friendless
(3)---un表示否定
known---unknown,polite---unpolite
(4)---ir表示否定
regular---irregular;reparable---irreparable
(5)dis表示否定
able---disable;honest---dishonest