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3 Vocabulary 4 Grammar

Circle the correct words.

1. I need to download / communicate a must – have to
new anti-virus program from the Internet.
• I must / have to learn how to use a computer. =
2. The keyboard / screen is very dark. I
It is necessary for me.
can’t read anything.
• You mustn’t use your mobile phone on a
3. If you decide to go to the cinema, send plane. = Don’t do it.
me a virus / message on my mobile. • You don’t have to go shopping today. = It isn’t
4. I don’t need this ile anymore. How can I necessary.
delete / destroy it?
5. I always check / update my homework NOTE:
when I inish it. The past tense of must and have to is had to.

Circle the correct words.
What is a virus? 1. I have to / had to buy a new keyboard last
A virus is a program that enters your week because there was a problem with
computer and stops it from working the one I had.
normally. A virus can destroy all your 2. You mustn’t / don’t have to go swimming
computer programs, and it can delete after you’ve eaten. It’s dangerous!
information. Sometimes you can even 3. Dennis has / must to go to the dentist. His
get strange messages on your screen, tooth hurts.
and then you know something’s wrong.
4. You mustn’t / don’t have to buy this
What can you do? © MM Publications
printer if you think it’s expensive. We’ll ind
If you don’t want your computer to get a cheaper one.
a virus, you have to get an anti-virus
program. You can buy one as a CD-ROM
but you don’t have to. If you like, you 5 Pronunciation 
can download one for free from special
websites. Anti-virus programs check Listen and tick (4) the sound you hear.
everything you download and protect
your computer from viruses. However, website // screen //
you have to update your anti-virus keyboard
program often. New viruses appear all the modem
time! even
press
correct
medium
B. Read again and answer the questions.
check
1. What’s the Internet? people
2. What can you do on the Internet?
3. What can a virus do?
4. How does an anti-virus program 6 Write
help? Write two sentences about what you
5. Why do you have to update your mustn’t do and what you don’t have to do.
anti-virus program?

I don’t have to clean my room every day.
I mustn’t use my mobile phone on a plane.

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