I am not sure who that book belongs to还是I am not sure whom the book belongs to

问题描述:

I am not sure who that book belongs to还是I am not sure whom the book belongs to

这两个句子都正确,
句意都是:我不能确定那本书属于谁.
who是主格,既可作主语,又可作宾语.
whom是宾格,只能作宾语.(用于正式场合)
I am not sure who that book belongs to.
此句中,who 作belongs to的宾语,that book 是从句的主语.
I am not sure whom the book belongs to.
此句中,whom 作belongs to的宾语,the book 是从句的主语.