Must’ DIALOGUE
SANDY: …it’s been ages since I’ve seen you.
JOHN: So how’s the new job? It must be hard work. You look very tired.
SANDY: Well actually, John, I quit yesterday.
JOHN: Wow! It must have been really bad!
SANDY: You’re not joking
‘Can’ DIALOGUE
STEVE: Can I help?
HELEN: I’ve left my money in the office.
STEVE: Oh dear. Well, err... Can I buy you a drink?
HELEN: Well, that’s very nice of you but…
STEVE: Please.
HELEN: A coffee then. Thank you.
STEVE: (CALLING) Sam. Can we have two coffees, please?
HELEN: It’s very nice of you. Thank you.
Most people, who have access to the internet, use the Internet to send and receive messages.8 In many developing countries, businessmen can use the Internet instead of expensive and unreliable telecom systems. One of the most important Internet issues is security. 9 E-mail is the most popular and simplest application of the global computer network, covering over 100 countries and tens of millions of users. 10 Computer-aided design with a computer is most widely used in electronics, electrical engineering, mechanics, mechanical engineering, architecture.