1. modal verbs exercise p. 73
This material doesn’t have to / mustn’t be used as it harms people’s health.
This material isn’t strong enough. It must / could break under pressure.
We must / could change the design, but I’m not sure that’s the answer.
We have a problem with the design but it doesn’t have to / shouldn’t be difficult to resolve.
We must / could be more innovative or we will go out of business.
We could / have to change the shape of the model so that it meets government regulations.
We can / must hire that designer. She’s the best in the business.

2. rewrite the sentences using must, can’t, could, might (p. 75)
Raymond Loewy is definitely one of the most influential designers of all time.
I’m sure this design is by Armani.
I’m sure this painting is not by Leonardo.
Maybe this painting is by Picasso, but I’m not sure.
Not many people are attending the exhibition. I’m sure they aren’t promoting it very well.
This product looks dangerous to me.
People are not sure if it is a Loewy design.
I’m sure that designer is working very hard. I’ve seen a lot of her designs.

3. rewrite the sentences using must, can’t, could, might (p. 75)
Raymond Loewy must be one of the most influential designers of all time.
This design must be by Armani.
This painting can’t be by Leonardo.
This painting might / could be by Picasso, but I’m not sure.
Not many people are attending the exhibition. They can’t be promoting it very well.
This product could be dangerous.
It might be a Loewy design.
that designer must be working very hard. I’ve seen a lot of her designs.

4. Both models have similar features. The Ericson model is much cheaper.
Use these words to link the sentences: also, although, as a result, consequently, moreover, on the other hand, however,
Both models have similar features. The Ericson model is much cheaper.
The Nokia model has more technical features. It is light and cheaper.
The Samsung Z320i has a new Internet service. Its battery life is excellent.
It is one of the smallest and light mobile phones. It is very easy to carry.

5. Use these words to link the sentences: also, although, as a result, consequently, moreover, on the other hand, however,
The phone has the best call reception. It is the cheapest of all the phones.
The phone worked perfectly after we poured water on it. We recommend it for people who work outside in all weathers.
Pay as you go offers good value if you don’t use your phone a lot. A pay-monthly contract is better for heavy users.
Our first impressions of the new phone are good. We will have to test it more thoroughly.