Tài liệu ngữ pháp tiếng anh tham khảo - Present Perfect- since and for
Trang 1Present Perfect:
Since and For
Bill Gates and
Microsoft
6
Trang 2Who 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
Trang 3
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
Trang 4Form 2
Form 2
Past participles can be regular or regular 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.
Trang 5Gates has been has been the CEO since 1975.
He and his wife have given have given lots of money to schools.
Form 3
There are many
irregular past participles.
There are many irregular past participles
Past participles can be regular or irregular.
Trang 6Form 4
Note these common irregular past participles common irregular past participles
write – written give – given
be – been see – seen read – read do
– done
Trang 7Bill Gates has been CEO of Microsoft since 1975.
Present Perfect
Use the present perfect to talk about something that
began in the past and continues into the present (and
may continue into the future)
future
1975
past
now
since 1975
has been CEO
Trang 8Bill Gates has written several books since 1975.
Using Since 1
Use the present perfect with since + point in time
to show when something started
future
1975
past
now
since 1975.
has written several books
Trang 9Gates has programmed computers since he was 13 years old.
Using Since 2
Since can also introduce a time clause
future
age 13
past
now since he was 13 years old.
time clause
Trang 10Change the sentences to present perfect Add the since phrase in parentheses and delete any past tense time phrases.
Maria was in the garden yesterday ( since 9 a.m.)
Practice 1
Maria has been in the garden since 9 a.m.
Maria has been in the garden since 9 a.m.
1 Bill Gates wrote many emails yesterday ( since 1975)
2 They gave a lot of books to schools last year ( since 1990)
3 I saw many friends last weekend ( since I came home)
4 My sister read many articles last night ( since last August)
5 My friend worked at a pizza place a year ago ( since 2003)
Example:
Bill Gates has written many emails since 1975.
Bill Gates has written many emails since 1975.
They have given a lot of books to schools since 1990 They have given a lot of books to schools since 1990.
I have seen many friends since I came home.
I have seen many friends since I came home.
My sister has read many articles since last August.
My sister has read many articles since last August.
My friend has worked at a pizza place since 2003.
My friend has worked at a pizza place since 2003.
Trang 11Millions of people have used Gates’s
software for the last three decades.
Using For
Use for + length of time to show how long
something has lasted
future past
now for the last three decades
have used Gates’s software
for three decades
Trang 12Since and For
Note the difference between since and since for for
five o’clock
yesterday
last summer
1996
he was a child
time
ten minutes two days three decades many years
a long time
Trang 13Complete the sentences with
since or for.
Bill Gates has been married to Melinda
French Gates _ 1994
Practice 2
1 Computers have been used in schools more
than a decade
2 I have had a computer in my office the
mid-1990s
3 Many students have worked with computers
many years
4 My computer hasn’t given me any problems
last year
Example:
since
for since
for since
Trang 14Copyright © 2006 Pearson Education and its licensors All rights reserved.