一、代词分类

　　主格：I, you, she, he, it , we, they , who

　　宾格：me, you, him , her, it, us, them, whom

　　形容词性：this that those these

　　二、高频代词知识点

　　1、 It的用法

　　(1) 特指句子中出现的某个单数或不可数的名词，但不可以特指前面出现的整个句子

　　例：

　　(2) 形式主语或形式宾语：It is +adj + to do/ that

　　(3) 强调句：It is + 被强调部分+ that/who

　　被强调部分可以为主语、宾语、状语等，且被强调部分为“人”的话，不可以用that，而用who

　　引申：do it 与 do so之间的比较

　　do so :可以指代整个的动作，包含谓语动词，宾语和修饰语

　　Q did not eat dinner quickly, but her brother does so.指代eat dinner quickly(so可省略)

　　Do it : it 必须指代一个确切的名词

　　Q failed to do the homework, but his brother did it.指代前面的homework.

　　Quinn did not eat the soup, but her brother ate it.

　　2、 That的用法

　　(1) 当that作为名词性从句引导词时，that尽量保留，但不保留并非绝对性错误

　　(2) 当that作为非从句引导词时，

　　①不能指代前面出现的整个句子

　　例如：(1)I play football a lot. That/This makes me healthy. 是错误的。(this同理不能指代前面出现的整个句子)

　　(2)As the honeybee’s stinger is heavily barbed, staying where it is inserted, this results in the act of stinging causing the bee to sustain a fatal injury.

　　分析：根据语义，this 在此处想要指代前面整个句子，因此是错误用法。

　　②可以用在比较句中，进行与其他对象的比较

　　例如：Laos has a land area comparable to that of Great Britain.