英语高手请进 代词one,ones 与that的区别

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)The streets in Beijing are wider than “those” in Donguanthe streets是泛指街道 为不是特指一条街道所以用those