不明白什么情况下用This is回答，什么情况下用 it is回答。 意思貌似一样，有什么区别吗。

Question

新概念一册中的练习题

Is this your school? - yes,it is my school.
Is this your umbrella? - yes,it is my umbrella.

Is this your ticket? - yes,this is my ticket.
Is this your teacher? - yes,this is my teacher.
Is this your pencil? - yes,this is my pencil.

Is this your watch? -no,it isn't my watch.
Is this your daughter? -no,it isn't my daughter.

Is this your suit? -no,this isn't my suit.

Answer 1

this是指“这”的意思，一般用于第一次提到时使用
比如说, This is a pen.（这是一把钢笔）
it 是指代之前或上文中提到的东西，翻译成“它”，还拿上面的这个句子举例
This is a pen. It is very expensive.(这是一把钢笔，它很贵)