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 introduce mainly to make the meaning of C easier to understand.
Introductory “it” can fill the position both of the subject and object.

Introductory “it” as a subject:
To watch musical programs is pleasant.
It is pleasant to watch musical program

Introductory it with seem, appear and look
• Introductory it is also used with seem, appear and look when the subject is an invite phrase, a phrase with a greund in it or a clause.

• It looked doubtful wether she would come
It seemed strange that she should behave like that.

It is sometimes used as the object of the verb think, feel, count, consider etc….

• I consider it a privilege to have this opportunity of welcoming you.

Introductory it in question
 When wasit that th manager came?
It was at 10 am that manager came..