IV Fill in the gaps in these sentences with a suitable verb. Use either the Present Perfect or Past Simple.

UNIT 1

Computer Users

Past Simple and Present Perfect

Study these examples of the Present perfect from the recording of the artist.   1. I've scanned in about a third of these photographs. 2. I've organised the paintings into themes. 3. I've added a sound track.   Why doesn't the speaker use the Past simple?   4. I scanned in about a third of these photographs. 5. I organised the paintings into themes. 6. I added a sound track.

We use the Present perfect to describe past actions with present relevance. The artist uses the Present perfect because he is describing a CD he has just made and what he is going to do with it in the near future.   We use the Past simple to describe completed actions in the past. It is often used with time expressions such as last year, before PCs were introduced, in 1998. Note these examples from the recording:   7. I made one for Mary's birthday last week. 8. We tried it out lost term.

I Match the two halves of these sentences.

1. We used the Internet to email our tutors,

2. I have started my own website for other students doing my course,

3. They have just installed a multimedia computer in the office,

4. Just as television has extended human sight across the barriers of time and distance,

5. When the children stood on pressure pads under the mat,

a. they could move about inside the pictures on the screen.

b. to process different forms of data, including text, graphic, audio, animation and video.

c. if we had any problems with our course papers.

d. so the computers extend the power of the human mind across the existing barriers.

e. so we can chat about assignments and help each other if we are in difficulty.

II Choose the correct form of the verbs in brackets.

1. you ever (send) a video email attachment? Who you (send) it to?

2. I never (fit) an expansion card. Which type you (fit) last week?

3. I know you (make) your own website. How you (design) it?

4. I (not fix) a printer fault yet. Have you? What kind of fault you (fix)?

5. you ever (use) Dogpile search engine? – I (try) it but I (have) more luck with Ask Jeeves.

III Make questions to find out this information from your partner. Make sure you use the correct tense in your questions.

Example: write a program / which language

a. Have you ever written a program?

b. Which language did you write it in?

1. use smart devices / what

2. virus-check floppies / when

3. use a search engine /which

4. scan photos in / how many

5. use your computer to write your assignments / how many

6. copy an image of an active window to the Clipboard / what keys

IV Fill in the gaps in these sentences with a suitable verb. Use either the Present Perfect or Past Simple.

Search / scan in / organize / connect / encourage / add / learn (x 2)

1. This program … (1) … the users to work together.

2. I … (2)… about 20 photos to make a CD.

3. The artist … (3)… his paintings into themes and …(4)… a sound track so that each group of paintings is accompanied by music.

4. Mike … (5)… the Web for sites on digital cameras on Monday.

5. We … (6)… to use word processor for creating and editing texts, but we …(7) … to use spreadsheets for calculating mathematical formulas.

6. We … (8) … our computers together to form a network which enables computers and software to communicate and to share resources.

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