Question

急急急急！！！

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）