Ex. 14. Fill in the spaces with the verbs to be, to havein Present, Past or Future Indefinite.

1. Bricks ___ a primitive form. 2. Common examples of beams ___ the steel beams used to support floors in the building. 3. Semenov ___ not present at classes last week. He ___ ill. 4. I ___ an architect when I grow up. I like to draw buildings and different structures. 5. Many problems of engineering practices of ancient times ___ similar to those that modern engineers ____. 6. When I come home tomorrow, all my family ___ at home. They will be discussing the reconstruction project of our apartment. 7. Engineering students usually ___ three lessons of English a week. 8. My sister ___ not ___ at home tomorrow. She ___ an excursion to the factory to see the assembly of prefabricated house. 9. Wood ___ the most ancient structural material. It __ easy to work with and its mechanical properties ___ good. 10. On the other hand, wood ___ certain disadvantages.

Structure of Sentences