UNIT 2 Computer Architecture 2

COMPUTER ARCHITECTURE 2

UNIT 2

Index

GRAMMAR

BOOK ANSWER'S KEY

Present perfect

Present Perfect

NOTES

VIDEO

EXERCISE 1

EXERCISE 2

Present Perfect FORM

Affirmative

S + have/has + past pariciple

HeSheIt

IYouWeThey

has

have

+

+

+

+

played

played

3rd form of verb

3rd form of verb

Negative

S+haven't/hasn't+ past pariciple

HeSheIt

IYouWeThey

played

played

3rd form of verb

3rd form of verb

+

+

+

+

has nothasn't

have nothaven't

Interrogative

Have/Has +S +past pariciple?

HeSheIt

IYouWeThey

played

played

3rd form of verb

3rd form of verb

+

+

+

+

Have

Has

Present Perfect Use

-To talk about the recent past when we don’t specify a time I have made lunch

- For something that happened in the past but is important in the present: I can't get in the house. I've lost my keys.

Teresa isn't at home. I think she has gone shopping.

- To talk about past experiences I have been to Paris

- For something that started in the past and continues in the present: They've been married for nearly fifty years. She has lived in Liverpool all her life.

For / Since

+ period of time+ number+ time word

We use FOR to talk about a length of time, a period of time

I have worked here for 8 years. You have played football for around ten years. We have taught at this school for a long time.

+ strating point+ a time/ a date

We use SINCE to talk about a point in the past, a specific point in time.

He has lived here since 1993. They have been at the hotel since last weekI haven’t ridden a horse since I was 9. You have worked here since you left your school. I haven’t been on holiday since last year.

FOR

SINCE

Yet/already /just

ALREADY

It means something happened before you expected

It is used in affirmative sentences before the main verb

He has already brushed his teeth

YET

It is used in negative sentences and in questions before the main verb at the end o the sentence

It means "until now"

Have you finished that yet?Sorry, but I haven't finished it yet

JUST

It means something happened a short time ago

My boss has just left the office

Go back to grammar

Go back to grammar

play

just/yet/alreadyfor/since

Has Morris finished his studies _________ ?

YET

JUST

ALREADY

QUestion 1

Next

YET

ALREADY

QUestion 2

Maria has ______________ phoned from Italy. I spoke to her a few minutes ago

JUST

Next

YET

JUST

ALREADY

QUestion 3

I can't go to Spain. I have _____________ booked two tickets for Italy. I booked them a few months ago

Next

YET

JUST

ALREADY

QUestion 4

The concert will start in two hours but the singers haven't arrived________

Next

YET

JUST

ALREADY

QUestion 5

Congratulations ! You have____________ won a trip to New York

Next

SINCE

FOR

QUestion 6

They have been living in Madrid __________1972.

Next

FOR

SINCE

QUestion 7

He has been in prison ________ four years

Next

FOR

SINCE

QUestion 8

He has known about the fact___________ a long time

Next

SINCE

FOR

QUestion 9

Conditions have changed a lot ___________ we were children

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