> 指示代词：标识人或事物的代词，用来代替前面已经提到过的名词 `this这个 these这些 that那个 those那些` ``` This is his book. Those apples were his. ``` > 不定代词：指代不确定的人或事物。 `one一个 the other另外一个 some一些 any一些 each每一个 something某物 nothing什么都没有` ``` No one knows where he is. Some of the boys want to go to Shanghai,but the others wnat to go to Xi'an. Each of the students has got a book. ```