-en作后缀

　　1.形容词或名词+en=动词,表"使~(化);变成~(化)",如:

　　sharpen,weaken,strengthen,deepen,harden,lessen,redden,frighten,hasten,heighten,lengthen,

　　2.某些动词+en=过去分词(不规则变化),可作形容词用,如:

　　chosen,fallen,hidden,spoken,written

　　3.物质名词+en=形容词,表"~的;~制的",如:

　　earthen,golden,silken,wooden,woolen

　　en-作前缀,指"使"(make),"入内"(in)之义.(把形容词,名词动词化)

　　encourage,endanger,enforce,enlist,enlarge,ennoble,enrich,ensure