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”.

Introductory “it” as a subject:
A : To watch musical programs is pleasent.
B : It is pleasent 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 infinitive phrase with a gerund ini t or a clause.

- It looked doubt fl whether she would come.
- It seemed strange that she should behave like that.
It is sometimes used as the object of the verbs think, feel, deem, count, cons, etc…
- I considered it a privilege to have this opportunity of welcoming you.
Introductory it in question
- When was is that the manager came?
- It was at 10 am that the manager came.