Use the following statements in the past and future.

Date: 2015-10-07; view: 409.

Say what these people could do in the past.

For example:

• I cannot use the new apparatus now but I could use it yesterday.

1. He cannot do research on copper alloys this term but he … it last term.

2. We cannot compare the properties of these substances now but we … them during our previous experiment.

3. They cannot study aluminium bronze at the lesson now but they … it in the lab yesterday.

4. We cannot extract copper with the help of stone and bone but ancient people … it in this way thousands of years ago.

5. I cannot describe the results of his experiment today but I … them yesterday.

13. Give advice to your friend in the following situations. Use the modal verb should.

For example:

• Student A: I have an examination tomorrow.

Student B: Well, you should work very hard tonight.

1. I don't know how to draw up a report of my experiment.

2. I'm very tired after the practical class.

3. I'd like to know more about plastics.

4. I'd like to buy good sports equipment.

5. I want to become a materials engineer but I don't know what I must study and at what University.

For example:

· He can drive well / He may continue the research.

He could drive well 10 years ago / He was allowed to continue the research.

He will be able to drive well in a month / He will be allowed to continue the research.

1. He can continue his studies at the Mechanical Engineering faculty.

2. Our engineers can extract copper in several ways.

3. You may use carbon steel in the construction of this building.

4. I can visit the Bingham Canyon copper mine.

5. She may extract iron from iron ores.

6. You may use manganese for changing properties of steels.

7. This new car can move without a driver.

8. You may apply alloy steels for various engineering purposes.

9. The scientists can use the samples of this substance in the test.

10. The engineer may increase the carbon content of the steel.