1) 用half of, part of, most of, a portion of 等詞引起主語時，動詞通常與of后面的名詞，代詞保持一致。

　　Most of his money is spent on books.

　　Most of the students are taking an active part in sports.

　　2) 在一些短語，如 many a 或 more than one 所修飾的詞作主語時，謂語動詞多用單數形式。但由more than of 作主語時，動詞應與其后的名詞或代詞保持一致。

　　Many a person has read the novel.　許多人都讀過這本書。

　　More than 60 percent of the students are from the city.百分之六十多的學生都來自這個城市。