mygodhome的专栏

1. 增补2.比较3. 对照

情态动词：can, chould ,shall ,should,will,would ,must。人称代词：you ,he ,we, his, her, me , him, us, them。连词：as , so, but ,or, and ,than, that\。be 动词： be, am,is , are ,was,were。介词： at, of., till,to ,for, from。助动词：do,. does, have ,has ,had。不定代词：some,any, an,such。