The materials used for the wall construction can be brick, stone, concrete and other natural and artificial materials. Roofs cover the building and protect it from exposure to weather. They tie the walls and give the construction strength and firmness. Floors the building into stories. 2. The designer must how the beams and the girders must be placed and arranged. 3. The framework is clothed with various materials. 4. The materials for the wall construction can be natural and artificial 5. The part upon which the stability of the structure depends is the framework. It is intended for safely carrying the loads imposed. The floors, walls, roof and other parts of the building must be carefully designed and proportioned. 7. Sinking and settling of a construction can cause cracks in walls and uneven floors. 3. Write these sentences in the Past and Future Simple tense forms. 1. The designer must determine the height of the ceiling. 4. The part upon which the stability of the structure depends is the basement. 5. The walls and other parts of the building must be carefully proportioned. 6. The architect must decide what the size of the floors, the beams and the girders must be.