Exercise 4 1) should 2) could 3) must 4) may 5) should
Exercise 5 1) Вам следует быть более внимательным. 2) Он будет иметь возможность это сделать. 3) Вам будет разрешено пойти домой. 4) Мне позволили принять участие в обсуждении 5) Я обязан пойти туда. Мне следовало бы пойти туда.
Exercise 6 1) Should you say such words? You shouldn't say such words. 2) Is he not to do it? He is to do it. 3) Don't you need to go there? You need go there. 4) Had he change his plan? He had not to change his plan. 5) Do you must eat to live? You must not eat to live. 6) Should you write to him? You shouldn't write to him.
Exercise 7 1) Do I usually get up at 7 o’clock? 2) Do I always go to my office by bus? 3) Did they visit a museum last Sunday? 4) Will Helen meet her friend near the University tomorrow?
4 1. Is concrete a natural or artificial stone? 2. What kind of properties it has? 3. In what way can concrete be used in moulds? 4. Does it resist fire? 5. Is concrete used in skeleton structures? 6. How many functions have aggregates? 5. 1. In other words aggregates CAN be defined as a mass of practically inert mineral materials, which ... 2. All aggregates both natural and artificial which have sufficient strength and resistance to watering and which do not contain harmful impurities MAY be used for making concrete. 3. As aggregates such materials as sand, pebbles, broken stone, broken brick, gravel,slag, sinder, pumice and others CAN be used. 4. It sets under water, CAN be poured into moulds so as to get any desirable form. 6. 1. can 2. may 3. must 4. can 5. has to help 7. sets,can be poured, has, resists.- Present Simple.
будущее выраженное Present Cont
Объяснение:
тк будущее может выражаться 4 разными временами - это один из них.
так же перепроверь написание, после are обычно идет Ving