be动词:am,is,are,was,were,been,ain't;助动词:do,did,done;情态动词:can(could),may,must,need,ought to,shall(should),will(would);一般动词:walk,read,write,sing,dance,drink,drive,make,play,hit,look,dig,find,bear,beat,become,begin,blow,build,choose,catch等等,太多了。所谓的从词根判断词性,只能对付大多数情况,总有个别例子,要在你学习中不断发现、总结