That's how we ask for and give permission in English. Study the table.

Date: 2015-10-07; view: 445.

The students are at the seminar on metal technology. Listen to their discussion and learn what properties copper has and where it can be used. Insert the appropriate modal verbs.

Professor: Dear students, today we're going to discuss the main properties and applications of copper. So far, what … you say about this metal?

Alex: If I'm not mistaken, copper is a non-ferrous metal. And it … be found in a free state in nature.

Nick: And as far as I remember, people … to extract this metal in prehistoric times. Various things such as weapons, tools and decorations … be made of it.

Professor: Very good. Were those copper tools very reliable?

Alex: I think not. Pure copper is a soft ductile metal. Strong cutting tools … be made only of copper alloys such as bronze.

Professor: OK. What are the present applications of copper?

Nick: Well, they are numerous. Copper metals … be used in most domestic appliances. Electrical industry is impossible without copper wiring as it is a very good conductor of electricity. Also, copper is corrosion resistant which makes it valuable for marine industry. Besides, this metal is even used in making money!

Professor: You are quite right. Tomorrow we … to study the valuable properties of copper in the practical class.