Present Perfect:
Since and For
Bill Gates and
Microsoft
6
Who Is Bill Gates?
Who Is Bill Gates?
Bill Gates is one of the richest and most
successful business executives in the world.
Millions of people have used his computer
programs for the past three decades.
Bill Gates has always loved working with
computers. In fact, he has programmed
computers since his early teens.
He has been the CEO of Microsoft Corporation
since 1975. Since then, Bill Gates has written
several books and has given billions of dollars to
schools. For the last several years, he and his
wife Melinda have donated a substanial amount
of money to organizations working in global
health.

Form 1
Form 1
The present perfect is formed with:
Bill Gates
has been
has been the CEO since 1975.
Many people
have used
have used

There are many
irregular past participles.
There are many
irregular past participles.
Past participles can be regular or irregular.