先说非连续动词,又叫非持续动词、终止动词、瞬间动词、短暂动词,指持续时间短暂的动词.如open,close,end,finish,leave,go ,come,join,become,get to,get,get to know,buy,borrow,lend,give等.连续动词,又叫持续动词,指持续时间长的动词.如read,work,walk,wait,be,keep,live,teach等.这两者的区别在现在完成时中具有典型的意义.英语中和汉语中不同,汉语的动词是“橡皮筋”,随长随短.英语则区分严格.由于汉英的这种差异,学起来是有点别扭.比如：He joined the Army 2 years ago.他两年前参军的.（过去时,强调动作本身）He has joined the Army.他参军了.(现在完成时,非连续动词,强调结果)He has been in the Army for 2 years.=He has been a soldier for 2 years=He has been in the Army since 2 years ago.(现在完成时,连续动词,强调“两年了”)他参军(当兵)两年了.这“两年”是时间段,所以必须用持续动词,所以改用“be” 短语.其它上述动词的区别与此类似