三、代词

　　使用代词时请注意其单、复数，主、宾格以及形容词性物主代词和名词性物主代词的用法。

　　12. He is one of those speakers who make his ideas perfectly clear.

　　定语从句的先行词是those speakers，为复数，因此从句中的指示代词应为复数，应把his改为their。

　　13. Whom do you think has left the lights on?

　　放在疑问句特殊疑问词后的do you think / believe / guess / imagine / suppose等都不参与句子成分，把它们去掉后，疑问词在句中做主语用主格，做宾语用宾格。本句中去掉do you think后缺的是主语，应把Whom改为Who。

　　14. The boss pretended not to see John and I.

　　John和I在句中都做的宾语，应把I 改为me。

　　15. These books are mine; those in the bag are her.

　　Her是形容词性物主代词，后面应该加名词books，或把her 改为hers。

　　四、数词

　　16. There are fourteen hundreds students in our school.

　　Hundred / thousand / million / score/ dozen等词前有具体数字时后不加s，前面没有具体数字时在其后加s 和of，表示大约几百几千的概念。如 two hundred students(两百个学生)，hundreds of students(成百上千个学生)。例句中应把hundreds 改为hundred。

　　17. Their school is twice as larger as our school.

　　表倍数关系的as---as中间只能用形容词或副词的原级。因此把larger改为large.

　　18. Today’s homework is a five-hundred-words composition.

　　几个单词由连字符连接而组成的复合形容词中的名词只能用单数，所以把five-hundred-words改为five-hundred-word.

　　19. Two third of the students in our school are from America.

　　英语表达中分数的分子用基数词，分母用序数词，分子大于一时分母后要加s，所以就把third 改为thirds.