如题所述
it就是同物指代，就是指代上下文同一个事物，范围等大，如：
I have a book ，do you want to have a look at it？这里的it就是指代a book，范围没有变化
但是，that指代，虽然指代同一个名词，但是范围变了
如 The population of City A is much larger than that of City B。
这里的that指代的是population，但是范围不是前面的City A 而是CIty B 了。
希望能帮到您
I have a book ，do you want to have a look at it？这里的it就是指代a book，范围没有变化
但是，that指代，虽然指代同一个名词，但是范围变了
如 The population of City A is much larger than that of City B。
这里的that指代的是population，但是范围不是前面的City A 而是CIty B 了。
希望能帮到您
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第1个回答 2012-03-19
it通常用于前文提到的同一个事物，且为具体的，可数的名词；that通常用于前文提到的同一个名词所指的抽象概念，且常常是不可数的名词，常常有介词of短语作后置定语；即使是具体的名词，但也并非就是前文提到的名词指代的同一物。
I lost my cell phone yesterday,and I couldn't find it everywhere.I have to buy one again.
The weather of Xinjiang is worse than that of Guangzhou.
I lost my cell phone yesterday,and I couldn't find it everywhere.I have to buy one again.
The weather of Xinjiang is worse than that of Guangzhou.
