it代表已知的一个物体，特制这个。例如：This dog is clever,I want it.
one代表某"一个"已知的物体，但是并不特制。例如：These dogs are clever, I want one.
that代表那一个，或者是与之前相对的另一个。例如：This dog is clever,but I prefer that dog.
the one代表特制的某一个物体。一般情况下需跟相对应的定语。例如：These dogs are all clever,but I want the one which is white.
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