INTODUCTORY 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.   

EXAMPLE OF INTRODUCTORY “IT” :

• To watch musical programs is pleasant.
• It is pleasant to watch musical program.

• To play football must be fun.
• It is fun to play football.

• It is easy to make a blog.
• To make a blog is easy.
  

WHAT ARE MODALS?

Modals are helping words that are used to express: (1) Possibility,

(2) Ability,

(3) Degree of certainty, and

(4) Level of authority

KINDS OF MODALS SUCH AS:

  Can, could, may, might, must, ought to, shall, should, will, and would.

MODALS IN THE PAST FORM

• Are used in the past time.They are could, would, should, and might.
• Formula of modals is:
• Modals + verb 1 + O/C.
• Can be used in every tense.