some of ...后面可接复数名词,或不可数名词
1 当后面接复数名词时,谓语动词用复数.如 Some of the books are new.
2 当后面接不可数名词时,谓语动词用单数.如 Some of the tea is new.
of 是介词,介词后面接人称代词宾格.如 Some of them ...
some of the student 不对,应该把student 改为复数：some of the students
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