代词one,it,that的用法区别代词one, it that的用法在历届高考题中出现的频率较高,是高考的热点之一。1)one, it, that常常用来代替或避免重复某个名词。例如:Im looking for a flat. Id really like one with a garden.-Where did you find your watch? - I find it in our classroom.The population of China is larger than that of any other country.2)one可指人或物,只替代单数可数名词,复数用ones. One是泛指,但有限定修饰语,如the, this, that修饰就变成了特指。如:One must do ones duty. Mary has a red pencil and Jane has a blue one.The new designs are much better than the old ones.