孩子作文里写 "The dog wagged it's tail"，老师一看就错。it's 是"它是"，"它的"是 its，没撇号。
its vs it's
- its = 它的（物主代词，没撇号）
The dog wagged its tail. 狗摇它的尾巴。
- it's = it is 或 it has（有撇号，是缩写）
It's a cute dog. = It is a cute dog.
It's been raining. = It has been raining.
判断办法：把句子里的 it's 换成 it is 或 it has，读得通就用 it's，读不通就是 its。
your vs you're
- your = 你的、你们的（物主代词）
Is this your bag? 这是你的包吗？
- you're = you are（你是/你们是）
You're my best friend. = You are my best friend.
判断办法：把 you're 换成 you are，读得通就用 you're。
类似坑一组
- their = 他们的 / there = 那里 / they're = they are
Their books are over there. They're reading.
- 别和 its' 混——英语里根本没这个词。
口诀：撇号是缩写，名词性物主代词不加点；拿不准就拆开读，it is / you are 通不通。
