some of the English books belong to me and some are ()是填yours and theirs还是这两个词的其他形式 说明理由
问题描述：
some of the English books belong to me and some are ()
是填yours and theirs还是这两个词的其他形式 说明理由
答
填yours 或者theirs
理由是yours theirs是you 和they的物主代词 意思是你/他们的东西
答
这两个都不好，and前后应该一致，所以用you或者them。
（这个是最容易理解也最容易记的解决方式）
答
you or them
句子还原为
some of the English books belong to me and some of the books are belong to u and them .
答
you and them,因为belong to后应跟宾语的。
答
some of the English books belong to me and some are (you and them)
这句话明显属于省略句,省略了宾语.补充完整应为:
some of the English books belong to me and some of the English books belong to you and them.
为避免累赘,所以原话中用谓语are代替belong to而直接+宾语you和them完成.