二）复数以s结尾的直接在s后加’，如果不是以s结尾的与单数一样处理。如：Teachers’Day教师节, classmates’; Children’s Day六一节, Women’s Day三八节

三）由and并列的名词所有时，如果是共同所有同一人或物时，只加最后一个’s，但分别拥有时却分别按单数形式处理。如：Mike and Ben’s room迈克和本的房间（共住一间），Mike’s and Ben’s rooms迈克和本的房间（各自的房间）2、代词

项目人称代词物主代词指示代词反身代词

人称主格宾格形容词名词性

第一人称单数I me my mine myself

复数we us our ours ourselves

第二人称单数you you your yours yourself

复数you you your yours yourselves

第三人称单数she her her hers herself

he him his his himself

it it its its this that itself

复数they them their theirs these those themselves

3、动词

A）第三人称单数