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3 Vocabulary 4 Grammar

Circle the correct words.
1. I need to download / communicate must – have to
a new antivirus program from the
• I must / have to learn how to use a computer. = It is
internet.
necessary for me.
2. There’s something wrong with
• You mustn’t / can’t use your mobile phone on a
the printer / speakers. I can’t hear
plane. = Don’t do it.
anything. • You don’t have to go shopping today. = It isn’t
3. If you decide to go to the cinema, send necessary.
me a virus / message on my mobile.
4. I don’t need this file anymore. How NOTE:
can I delete / destroy it? • The past tense of must and have to is had to.
5. I always check / update my • In formal contexts, we can use the Imperative to
© MM Publications
homework when I finish it. show what someone must or mustn’t do.
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Circle the correct words..
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To download the program, click on the green button.
What is a virus? 1. I have to / had to buy a new keyboard last week
A virus is a program that enters your because there was a problem with the one I had.
computer and stops it from working 2. You mustn’t / don’t have to go swimming after
normally. A virus can destroy all your
computer programs, and it can delete you’ve eaten. It’s dangerous!
information. Sometimes you can even 3. Dennis has / must to go to the dentist. His tooth
get strange messages on your screen, hurts.
and then you know something’s 4. You mustn’t / don’t have to buy this printer if you
wrong. think it’s expensive. We’ll find a cheaper one.
What can you do?
If you don’t want your computer
to get a virus, you have to get an 5 Pronunciation 
antivirus program. You can download Listen and tick (4) the sound you hear.
one from special websites, sometimes
even for free. Antivirus programs website // screen //
check all the information you keyboard
download, so you can surf the net enter
safely. But if you want to protect your even
computer from viruses, you have to
update your antivirus program often. press
New viruses appear all the time! correct
medium
check

B. Read again and answer the people
questions.
1. What’s the internet? 6
2. What can you do on the Write
internet? Write two sentences about what you
3. What can a virus do? mustn’t do and what you don’t have to do.
4. How does an antivirus
program help?
I don’t have to tidy my room every day.
5. Why do you have to update
I mustn’t use my mobile phone on a plane.
your antivirus program?

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