one of 其中一个one of 后面加复数名词 He is one of my friends.both of两个都是 Both of us are in Class 2.all of 全部都是(三个或三个以上)All of them are boys.most of 大多数是 Most of them are middle school students.the rest of 剩下的 I am going to read the rest of the book.none of没有一个是 None of the books are mine.
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