one与it；ones与they的区别

Question

one与it；ones与they的区别

Answer 1

1.that:比较句中替代词,不可数名词that替
2.it:替代若系本身物,it 代单数 they 代复数
指代动物、物品,可以直接用于句中.
it is hers/they are theirs
指代前面的一句话等,放在前面一句话之后紧接着的句子中,做主语用
3.有的时候通用：that/it is great!
4.one 和ones 指代前面已经说过的物品,放在前面一句话之后紧接着的句子中,做宾语用.one 指代单数物品,ones 指代复数物品
one泛指或者指代前句的each已经说明是单数形式
The apples here are very small,this is the biggest one.
ones (those后+名词复数）
girls in this class are beautiful,those ones are the hottest!
5.the one(特指,后面为定语从句)
举例说明：
1,Yesterday i bought a new bike .it is blue.(it指前文刚提到的名词单数）
2.I have many friends .They are all young.(they前文刚提到的名词复数）
3.A bridge made of stone is stronger than one made of wood（one是单数与前文不定冠词对应）
4.The bridge made of stone is stronger than that made of wood.（that=the one 表示特指与前文定冠词the对应）
5.The people who are standing there are those(=the ones) from Japan
（the ones 与those复数特指,与定冠词the people对应）
6 .Bridges made of stone are stronger than ones made od wood(ones不定指的复数,与前文的bridges 对应）