one it that的区别

one it that的区别

one = a +上文出现的名词
it 用来指代上文出现的单数名词（（必需是单数名词， 包括可数名词单数和不可数名词））
that= the +上文出现的名词（必需是单数名词， 包括可数名词单数和不可数名词）
that不是用来指代上文的名词，而是另外一个。

比如：There are many bags. I want to buy one. = I want to buy a bag.
I saw a dog on my way to school. It was big. it指上文的那条狗。
The weather in Nanjing is hotter than that in Beijing. that=the weather, 但并非指上文的天气， 而是另外一个天气。

one：一个或某人的意思，除了做数量词外常用于列举（常有其中一个的意思） eg：there are two bags on the table，one is white，the other is blue. 当前面有定冠词the 的时候，the one 就有了“特定”的意思 eg：there are two bags on the table，mine is the red one；为了方便比较，看成mine is the one that is red.就行了 it：“它”，指代事物，常作独立的个体，可以另起句子。可比较one 与it区别如下： eg：there are two bags on the table，one of which is mine.it is red. that：“那个”，可以用来接从句，作名词时也可指代事物。要分这个不困难，牢记它的中文意思，代入感觉是否通顺。 eg：如果把上一句的it改that就会很奇怪：那个是红色的。（它是红色的就可以了） that指代常有特定句型（比较级之类）the weather in shanghai is warmer than that in beijing. ps：参考自百科

简单讲one是泛指，that，it表特指 that同类不通物 It就只上文提到的物、 eg:I can't find my hat.I think I should buy one.(不定） The hat that you bought id bigger than that I bought.(同类但不同物） I can't find my hat.I don't know where I put it.(同一物）