I. Put the modal verb into Past .
1) These properties can make steel useful.
2) They must apply new methods.
3) We may work in the work-shop.
II. Put the modal verb into Future.
1) You can design new machine-tools.
2) Students must use their knowledge.
3) Our group may use the new machine-tool.
III. Translate into English the following sentences.
1) Мы можем охладить сталь быстро.
2) Ученые должны использовать новые технологии.
3) Разработчики инструментов могут( им разрешено) сделать чертежи.
Первая часть:
1) These properties could have made steel useful.
2) They must have applied new methods.
3) We may have worked in the work-shop.
Вторая часть:
1) You will be able to design new machine-tools.
2) Students will have to use their knowledge.
3) Our group may use the new machine-tool.
Третья часть:
1) We can cool the steel fast.
2) Scientists should use new technologies.
3) The developers of the tools are allowed to create blueprints.