present perfect since and for 5

8/4/2019 Present Perfect Since and for 5

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Present Perfect:Since and For

Bill Gates and

Microsoft

6



Who Is Bill Gates?

Bill Gates is one of the richest and mostsuccessful business executives in the world.Millions of people have used his computerprograms for the past three decades.

Bill Gates has always loved working withcomputers. In fact, he has programmedcomputers since his early teens.

He has been the CEO of Microsoft Corporationsince 1975. Since then, Bill Gates has writtenseveral books and has given billions of dollars toschools. For the last several years, he and hiswife Melinda have donated a substanial amountof money to organizations working in global

health.



Form 1

The present perfect is formed with:

Bill Gates has been the CEO since 1975.

Many people have used Microsoft’s programs.

+form ofhave

pastparticiple



Form 2

Past participles can be regular or irregular.

Gates has always loved

working with computers.

The regular form of the past participle is base form of verb + -d or -ed .



Gates has been the CEO since 1975.

He and his wife have given lots of money to schools.

Form 3

There are manyirregular past participles.

Past participles can be regular or irregular.



Form 4

Note these common irregular past participles.

write – writtengive – given

be – been

see – seenread – readdo – done



Bill Gates has been CEO of Microsoft since 1975.

Present Perfect

Use the present perfect to talk about something thatbegan in the past and continues into the present (andmay continue into the future).

future

1975

past

now

since 1975.

has been CEO



Bill Gates has written several books since 1975.

Using Since 1

Use the present perfect with since + point in timeto 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

Since can also introduce a time clause.

future

age 13

past

now

since he was 13 years old.

has programmed computers

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.)

Practice 1

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.

They have given a lot of books to schools since 1990.

I have seen many friends since I came home.

My sister has read many articles since last August.

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

Use for + length of time to show how longsomething has lasted.

futurepast

now

for the last three decades.

have used Gates’s software

for three decades



Since and For

Note the difference between since and for .

five o’clock

yesterday

last summer

1996

he was a child

since + point intime

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 MelindaFrench Gates ___________ 1994.

Practice 2

1. Computers have been used in schools __________ morethan 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

present perfect since and for 5

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