This is 和 It's 有什么区别?
问题描述：
This is 和 It's 有什么区别?
例如：
This is my private letter.
It's my private letter.
答
This is可用于人或物,例如：This is my friend.或 This is his book.或电话用语This is Mike speaking.
It's 主要用于介绍物.例如：It is a cute dog.