经常!对often提问，是个特殊疑问句often adv.（副词）经常, 再三How often does the train run? 这火车多久一班?【说明】此词一般用于动词之前, be 和助动词之后, 有时也用于句末以加强语气。 （1）often放在be动词后。He is often late for school.他经常上学迟到。 （2）often放在实义动词前。He often goes to school by bike.他常骑自行车上学。 （3）often与very或quite连用表示强调时，既可放句中，也可放句首或句末。My father very often goes to Beijing on business.Very often my father goes to Beijing on business.My father goes to Beijing on business very often.