it that one的用法区别
it that one的用法区别如下：
①it／one／that三者均可用作代词，指代前面提到的名词。一般说来， it指代同名同物；one与that则指代同名异物。
I have lost my umbrella；I'm looking for it．（该句中it就是指前面的my umbrella）
I have lost my umbrella；I think I must buy one．（one在该句中表泛指，因为my umbrella已经丢了）
The umbrella you bought is cheaper than that I bought．（替代词that在该句中特指“the umbrella I bought”，以区别“the umbrella you bought”）
②one与that虽可用来指代同名异物，但one为泛指，相当于a／an＋名词；that为特指，相当于the ＋名词。所以one所指代的名词的修饰语一般为 a／an ／some ／any；that所指代的名词的修饰语往往是the ／this ／that。
A chair made of steel is stronger than one made ofwood．（该句中one可以换成a chair）
The water in the cup is hotter than that in the pot．（该句中that可以换成 the water）
③one只能代替可数名词单数，代替可数名词复数时用ones；that既可以代替不可数名词也可以代替可数名词单数，代替可数名词复数时用 those。
I like this pen more than that one．（one代替可数名词单数pen）
There were a few young people and some older ones in the house．（ones代替可数名词复数people）
Mary's handwriting is far better than that of Peter．（that代替不可数名词 handwriting）
These pictures are more beautiful than those．（those代替可数名词复数 pictures）
