Ex. 12. Express the idea in (a) Past, (b) Future.

1. Computer-controlled robots must increase the productivity of industry.

2. To solve scientific problems, researchers must deal with the language of science – mathematics.

3. She should change the plug on her hairdryer.

4. The telephone company must increase its workforce by 10 percent.

5. We must delete something else to install the new software.

6. He should look for the information on the Internet.

7. At many companies, employees should attend classes in order to become computer literate.

8. The engineers must make major improvements on this device to do the experiment successfully.