經(jīng)常!對often提問，是個特殊疑問句often adv.（副詞）經(jīng)常, 再三How often does the train run? 這火車多久一班?【說明】此詞一般用于動詞之前, be 和助動詞之后, 有時也用于句末以加強語氣。 （1）often放在be動詞后。He is often late for school.他經(jīng)常上學遲到。 （2）often放在實義動詞前。He often goes to school by bike.他常騎自行車上學。 （3）often與very或quite連用表示強調(diào)時，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.