Tài liệu ngữ pháp tiếng anh present perfect since and for

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

Microsoft’s programs.
+
form of
have
past
participle
Form 2
Form 2
Past participles can be
regular
regular or
irregular
irregular.
Gates has always
loved
loved
working with computers.
The regular form of the past participle is
base form of verb + -d or -ed.
The regular form of the past participle is
base form of verb + -d or -ed.
Gates
has been
has been the CEO since 1975.
He and his wife
have given
have given lots of money to schools.
Form 3
Form 3

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