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。