介词：at,on,behind,during,from,into,onto,inside,outside,without,throughout等等
连词：and but or so however although even though even if such as
动词：be,seem,look,become,get,grow,feel,appear,remain,turn（连系动词）
情态动词有 can,will,have,be,should,do,would,等.
代词：she he its we them your you my myeself 等
冠词：a an the
匿名回答于2020-02-29 00:50:18
