that, those表示“那”、“那些”，是“远指”。
注意：在电话用语里面，用this代替自己，that代替对方。如：
who’s that? This is Tom speaking
二、不定代词
英语中有以下不定代词：all, each, every, both, either, neither, one, none, little(a little), few(a few), many, much, other, another, some, any, no还有由some, any , no every构成的代词。
1)both, all
both 是指“两者都”，而all则是指“三者或三者以上都”，如：
Both of us are right.
All of you are good at playing basketball.
但all 还可以组成固定短语 all day, all this, all the time等
2) either, neither
either 是指“两者之中任何一个……”，属于部分否定，而neither则是“两者之中一个也不……”，属全部否定
Either of the books will do.
Neither of the answers is right.
而either还可出现在否定句子里，可与neither进行句型转换。如：
Tom hasn’t been to America, Jim hasn’t, either.
= Neither Tom nor Jim has been to America.
而neither (nor) 也可用于表示“也不……”，构成“neither (nor) +助动词+主语”的句式。
Kate isn’t a worker, neither is Meimei.
3) little, a little, few, a few
little, a little修饰不可数名词; few , a few修饰可数名词;
little, few表示否定，“几乎没有”
a little, a few表示肯定，相当于some, any.
There is a little milk in the glass.
There are few students in the classroom, they’re in the reading-room.
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