it one ones the ones that the ones 作代替词时怎么区分？

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)

It一般指代前面出现的物。 比如：There is a book. It belongs to me.

One是不特指前面出现的物,泛指。 比如：You get a new watch.It's nice.And I want to buy one.

Ones是用在泛指出现复数的情况下。 比如：He buys a pair of shoes.I want to buy ones,too.

The one 是指双方都知道的某一个人或者物。比如：This school is the one we visited last week.

The ones为复数形式。

That的话常用在比较级中。比如:This tree is taller than that（tree）. 指代另外一个物体。有时也可以指某个谈话的人都知道的行为事情。比如：What's about go fishing? That's great!