UNIT 2 Computer Architecture 2
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Created on September 2, 2024
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Transcript
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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