one,ones,the one,that,those,this的用法区别

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）
亲,