one 指代前面出现的可数名词,是泛指。可以和冠词连用,也可以有自己的定语。一般不能用做特指,但和冠词连用时可以是特指。如:
Please show me the cup, the red one on the shelf.
It 指代前面提到的单数名词,相当于the one。当one是泛指的时候,指的是同名异物,it是指同一物体.如:
----Do you want the cup ?
---Yes ,I want it.
----Do you want the cup ?
----No, I want the red one.
that通常用来代替前面出现的可数名词\不可数名词,主要是用来避免重复。如:
The weather of Guangzhou is hotter than that of Beijing.
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