INTRODUCTORY IT

Lanjut chuy...kita fahami Introductory It...

A To understand this lesson is easy.

B It is easy to understand this lesson.
In this pattern, it has no meaning. It is used only to fill the subject position in the sentence. Thus, it is called introductory “it”.
A and B mean the same thing, but sentence B is more common and useful than A. A was introduced mainly to make the meaning of B easier to understand. Introductory “it” can fill the position both of the subject and object.
When the subject is a clause :
It does not matter whether he comes or not. (Whether he comes or not does not matter.)
Introductory it as an object :
Do you think it dangerous to drive when the way is slippery?
Introductory it in question
Who was it that broke the window?