1） 用half of, part of, most of, a portion of 等詞引起主語時(shí)，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(shí)，謂語動詞多用單數(shù)形式。但由more than… of 作主語時(shí)，動詞應(yīng)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(xué)生都來自這個(gè)城市。