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.
Form 4
Form 4
Note these
common irregular past participles
common irregular past participles.
write – written
give
– given
be – been
see – seen
read –
read do
– done
Bill Gates has been CEO of Microsoft since 1975.
Present Perfect
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
Bill Gates has written several books since 1975.
Using Since 1
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
Gates has programmed computers since he was 13 years old.
Using Since 2
Using Since 2

Since
Since

can also introduce a time clause.
future
age 13
past
now
since he was 13 years old.
has programmed computers
time clause
time clause
Change 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.)
since 9 a.m.)

Practice 1
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)
since 1975)
2. They gave a lot of books to schools last year. (
since 1990)
since 1990)
3. I saw many friends last weekend. (
since I came home)
since I came home)
4. My sister read many articles last night. (
since last August)
since last August)
5. My friend worked at a pizza place a year ago. (
since 2003)
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.
Millions of people have used Gates’s software
for the last three decades.
Using For
Using For
Use for + length of time

to show how long
something has lasted.
futurepast
now
for the last three decades.
have used Gates’s software
for three decades
Since and For
Since and For
Note the difference between
since
since and
for
for .
five o’clock
yesterday
last summer
1996
he was a child
since
+ point in
time
for
+ length of
time
ten minutes
two days
three decades
many years
a long time
Complete the sentences with
since or for.
Bill Gates has been married to Melinda
French Gates ___________ 1994.
Practice 2
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
since
for
for
since
since
for
for
since
since

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